Which of the Following Statements Is Correct

Which of the following statements is correct?

A) One disadvantage of zero coupon bonds is that the issuing firm cannot realize any tax savings from the debt until the bonds mature.
B) Other things held constant, a callable bond should have a lower yield to maturity than a noncallable bond.
C) Once a firm declares bankruptcy, it must then be liquidated by the trustee, which uses the proceeds to pay bondholders, unpaid wages, taxes, and lawyer fees.
D) Income bonds must pay interest only if the company earns the interest. Thus, these securities cannot bankrupt a company prior to their maturity, and this makes them safer to the issuing corporation than "regular" bonds.