57. To raise additional capital, a company's preference is to issue common shares, but, at present, markets are more receptive to a debt offering. Additionally, the company would like to minimize the coupon offered on any bond it offers. Which of the following types of debt security is most appropriate under these circumstances? a) Extendible bond. b) Foreign-pay bond. c) Convertible debenture. d) Floating-rate debenture. e) Retractable bond