Select the true statements from the following:

a. Preferred stock is often considered quasi-debt instrument. b. Preferred stockholders have preference over common stockholders in the distribution of earnings. c. Preferred stock is unlike debt in that it has no maturity date. d. Preferred stockholders are also usually given preference over common stockholders in the liquidation of assets in a legally bankrupt firm, although they must "stand in line" behind creditors. e. Preferred stockholders have preference over common stockholders in the distribution of earnings and in the liquidation of assets in a legally bankrupt firm. f. Preferred stockholders are also usually given preference over creditors in the liquidation of assets in a legally bankrupt firm.