Schedule of Omitted Supplemental Indentures to Supplemental Indentures, filed pursuant to Instruction 2 to Item 601 of Regulation S-K

Exhibit 4.28(c)

Schedule of Omitted Supplemental Indentures to Supplemental Indentures relating to the Company’s Senior Secured Notes

4.75% Senior Secured Notes due 2023 (Sixth Supplemental Indenture)

The supplemental indentures referenced below are substantially identical in all material respects to the Supplemental Indenture, dated as of January 3, 2018 (the “Supplement to the Sixth Supplemental Indenture”), to the indenture, dated as of August 1, 2011 (the “Base Indenture”) and filed as Exhibit 4.28(b) to the Company’s annual report on Form 10-K for the fiscal year ended December 31, 2019 (the “Annual Report”) as supplemented by the Sixth Supplemental Indenture dated as of October 23, 2012, and filed as Exhibit 4.28(a) to the Annual Report, except as to the names of the subsidiary guarantors listed on the signature pages thereto and the dates on which such supplemental indentures were entered into. These supplemental indentures are not being filed as exhibits to the Annual Report in reliance on Instruction 2 to Item 601 of Regulation S-K.

Supplemental indentures to the Sixth Supplemental Indenture entered into among Delaware Trust Company, as trustee and Deutsche Bank Trust Company Americas, as paying agent, registrar and transfer agent, and the following subsidiary guarantors on the dates indicated:

5.00% Senior Secured Notes due 2024 (Eighth Supplemental Indenture)

The supplemental indentures referenced below are substantially identical in all material respects to the Supplement to the Sixth Supplemental Indenture, except as to the indenture being supplemented, the names of the subsidiary guarantors listed on the signature pages thereto and the dates on which such supplemental indentures were entered into. These supplemental indentures are not being filed as exhibits to the Annual Report in reliance on Instruction 2 to Item 601 of Regulation S-K.

Supplemental indentures to the Base Indenture as supplemented by the Eighth Supplemental Indenture dated as of March 17, 2014 and filed as Exhibit 4.34 to the Annual Report, entered into among Delaware Trust Company, as trustee and Deutsche Bank Trust Company Americas, as paying agent, registrar and transfer agent, and the following subsidiary guarantors on the dates indicated:

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5.25% Senior Secured Notes due 2025 (Tenth Supplemental Indenture)

The supplemental indentures referenced below are substantially identical in all material respects to the Supplement to the Sixth Supplemental Indenture, except as to the indenture being supplemented, the names of the subsidiary guarantors listed on the signature pages thereto and the dates on which such supplemental indentures were entered into. These supplemental indentures are not being filed as exhibits to the Annual Report in reliance on Instruction 2 to Item 601 of Regulation S-K.

Supplemental indentures to the Base Indenture as supplemented by the Tenth Supplemental Indenture dated as of October 17, 2014 and filed as Exhibit 4.37 to the Annual Report, entered into among Delaware Trust Company, as trustee and Deutsche Bank Trust Company Americas, as paying agent, registrar and transfer agent, and the following subsidiary guarantors on the dates indicated:

5.25% Senior Secured Notes due 2026 (Fifteenth Supplemental Indenture)

The supplemental indentures referenced below are substantially identical in all material respects to the Supplement to the Sixth Supplemental Indenture, except as to the indenture being supplemented, the names of the subsidiary

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guarantors listed on the signature pages thereto and the dates on which such supplemental indentures were entered into. These supplemental indentures are not being filed as exhibits to the Annual Report in reliance on Instruction 2 to Item 601 of Regulation S-K.

Supplemental indentures to the Base Indenture as supplemented by the Fifteenth Supplemental Indenture dated as of March 15, 2016 and filed as Exhibit 4.46 to the Annual Report, entered into among Delaware Trust Company, as trustee and Deutsche Bank Trust Company Americas, as paying agent, registrar and transfer agent, and the following subsidiary guarantors on the dates indicated:

4.50% Senior Secured Notes due 2027 (Sixteenth Supplemental Indenture)

The supplemental indentures referenced below are substantially identical in all material respects to the Supplement to the Sixth Supplemental Indenture, except as to the indenture being supplemented, the names of the subsidiary guarantors listed on the signature pages thereto and the dates on which such supplemental indentures were entered into. These supplemental indentures are not being filed as exhibits to the Annual Report in reliance on Instruction 2 to Item 601 of Regulation S-K.

Supplemental indentures to the Base Indenture as supplemented by the Sixteenth Supplemental Indenture dated as of August 15, 2016 and filed as Exhibit 4.49 to the Annual Report, entered into among Delaware Trust Company, as trustee and Deutsche Bank Trust Company Americas, as paying agent, registrar and transfer agent, and the following subsidiary guarantors on the dates indicated:

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5.50% Senior Secured Notes due 2047 (Eighteenth Supplemental Indenture)

The supplemental indentures referenced below are substantially identical in all material respects to the Supplement to the Sixth Supplemental Indenture, except as to the indenture being supplemented, the names of the subsidiary guarantors listed on the signature pages thereto and the dates on which such supplemental indentures were entered into. These supplemental indentures are not being filed as exhibits to the Annual Report in reliance on Instruction 2 to Item 601 of Regulation S-K.

Supplemental indentures to the Base Indenture as supplemented by the Eighteenth Supplemental Indenture dated as of June 22, 2017 and filed as Exhibit 4.53 to the Annual Report, entered into among Delaware Trust Company, as trustee and Deutsche Bank Trust Company Americas, as paying agent, registrar and transfer agent, and the following subsidiary guarantors on the date indicated:

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