Footsteps Co. has a bond outstanding with a coupon rate of 6.4 percent and annual payments. The bond currently sells for $956.08, matures in 20 years, and has a par value of $1,000. What is the YTM of the bond? a. 6.81% b. 6.69% c. 6.13% d. 5.67% e. 6.40%