A bond issued by Goliath National bank has 15 years to maturity. It pays coupons semiannually, and the coupon rate is 8.25%. The yield to maturity on the bond is 6.50%. The bond has a $1,000 par value, but it can be called in 6 years at a price of $1,070. What is the bond's yield to call? a. 5.91% Ob. 5.85% O c. 5.32% d. 4.55% Oe. 7.21%