Which of the following statements is CORRECT? a. A zero coupon bond's current yield is equal to its yield to maturity. b. If a bonds yield to maturity exceeds its coupon rate, the bond will sell at par. c. All else equal, if a bonds yield to maturity increases, its price will fall. d. All else equal, if a bonds yield to maturity increases, its current yield will fall. e. If a bonds yield to maturity exceeds its coupon rate, the bond will sell at a premium over par