Which of the Following Statements Best Describes Preferred Stocks

Which of the following statements best describes preferred stocks?

A) Preferred stock cannot be converted into common stock.
B) Preferred stock holders are usually granted the right to vote only in the event that dividends due are fully paid to stockholders.
C) Redemption of preferred stocks is allowed irrespective of whether the cost would make the corporation insolvent or not.
D) If a corporation's articles allow redemption, the corporation can buy back preferred stocks even if the holders do not wish to sell.