Which of the following statements is CORRECT? a. Corporations cannot buy the preferred stocks of other corporations. b. Preferred dividends are not generally cumulative. c. Preferred stockholders have a priority over bondholders to the income in the event of a bankruptcy, but not to the proceeds in the event of a liquidation. d. A big advantage of preferred stock is that dividends on preferred stocks are tax deductible by the issuing corporation. e. The preferred stock of a given firm is generally less risky to investors than the same firm's common stock