Which of the following statements is true? Seleccione una: a. When investors' required rate of return is less than the bond's coupon rate, then market value of the bond will be greater than par value. b. When investors' required rate of return equals the bond's coupon rate, then the market value of the bond may be selling at par value. c. When investors' required rate of return exceeds the bond's coupon rate, then the market value of the bond will be greater than par value. d. When investors' required rate of return is less than the bond's coupon rate, then the market value of the bond will be less than par value