Dyl Inc.'s bonds currently sell for $850 and have a par value of $1,000. They pay a $50 annual coupon and have a 10-year maturity, but they can be called in 5 years at $1,070. What is their yield to maturity (YTM)? a. 7.15% b. 5.88% c. 5.84% d. 7.34% e. 7.57%