18) An obligation dependent upon an event that has not yet occurred is an example of a(n): [A] contingent liability. B] estimated liability C] known liability ID] accrued liability. [9 Bonds that are backed by collateral are: [A] unsecured bonds. B] convertible bonds. [C] callable bonds. [D] secured bonds. The rate of interest that investors are willing to receive for similar bonds of equal risk at the current time is the rate of interest. [A] stated [B] market [C] variable [D] maturity