Other things being equal, which of the following statements about interest rate risk is correct? Select one: a. A bond paying a 4% coupon rate is more risky than a bond paying a 2% coupon rate. O b. A bond paying a 4% coupon rate is more risky than a bond with a 7% yield to maturity. c. A zero coupon bond is less risky than a coupon- paying bond. d. A bond paying a 7% coupon rate is less risky than a bond paying a 5% coupon rate