Which of the following is a False statement about bonds?

a.) Callable bonds can be redeemed early by the buyer/holder of the bond.

b.) Unsecured bonds are also called debenture bonds

c.) A mortgage bond is a bond secured by real estate

d.) A convertible bond can be converted into something else, like stock.

e.) A sinking fund bond is a bond secured by specific assets set aside to redeem the bonds.