Which of the following statements regarding bonds payable is true? a. a convertible bond can be converted into stock of the issuing company. b. when an issuing company’s bonds are traded in the "secondary" market, the company will receive a service fee when the bonds are sold from the first purchaser to the second purchaser. c. a debenture bond is backed by inventory of the issuing company. d. generally, bonds are issued in denominations of $100.