ABC's bonds have 15 years to maturity, an 8.75% coupon paid semiannually, and a $1.000 par value. The bond has a 6.50% nominal yield to maturity, but it can be called in 5 years at a price of $1,070. What is the bond's yield to call? a. 5.70% b. 5.10% c. 5.82% d. 6.12%