Which of the following statements is most correct? Select one: a. All else equal, putable bonds have lower coupons than non-putable bonds. b. All else equal, callable bonds have lower coupons than non-callable bonds. c. All else equal, convertible bonds have higher coupons than non-convertible bonds. d. All else equal, indexed bonds have lower coupons than ordinary vanilla bonds. e. All else equal, income bonds have lower coupons than ordinary vanilla bonds