Bonds that are subject to retirement prior to maturity at the option of the issuer are called Oa. callable bonds Ob. options Oc. early retirement bonds d. debentures A legal document that indicates the name of the issuer, the face value of the bond and such other data is called Oa a convertible bond Ob. a bond indenture Oc. trading on the equity Od. a bond debenture The interest rate specified in the bond indenture is called the Oa. discount rate Ob. market rate Oc. effective rate Od. contract rate