6.Which coupon strip or the principal strip is NOT received in exchange for $100 million face amount of the 31 8 s of 5/15/2025, which was issued in 5/15/2015?

a. $1,562,500 coupon strip due 5/15/20 b. $100,000,000 principal strip due 5/15/25 c. $1,562,500 principal strip due 5/15/20 d. $1,562,500 coupon strip due 5/15/25