Optional Redemption: 

2021 Notes:
At any time, in whole or in part, at a price equal to the greater of (i) 100% of the principal amount of the 2021 Notes to be redeemed or (ii) the sum of
the present values of the remaining scheduled payments of principal and interest (at the rate in effect on the date of calculation of the redemption price) on the 2021 Notes to be redeemed (exclusive of interest accrued to the redemption date),
discounted to the redemption date on a semiannual basis (assuming a 360day year consisting of twelve 30day months) at the applicable treasury yield plus 10 basis
points; plus, in either case, accrued and unpaid interest to the redemption date.
2048 Notes:
At any time prior to August 15, 2047 (the “2048 Notes Par Call Date”): in whole or in part, at a price equal to the greater of (i) 100% of the
principal amount of the 2048 Notes to be redeemed or (ii) the sum of the present values of the remaining scheduled payments of principal and interest (at the rate in effect on the date of calculation of the redemption price) on the 2048 Notes
to be redeemed (exclusive of interest accrued to the redemption date) that would have been due if the 2048 Notes had matured on the 2048 Notes Par Call Date, discounted to the redemption date on a semiannual basis (assuming a 360day year consisting of twelve 30day months) at the applicable treasury yield plus 20 basis points; plus, in either case, accrued and unpaid interest to the redemption
date. On or after the 2048 Notes Par Call Date: in whole or in part, at a price
equal to 100% of the principal amount of the 2048 Notes to be redeemed plus accrued and unpaid interest to the redemption date. 