Multiple Choice Which statement is correct, everything else held contanct? Multiple Choice The standard deviation is used to calculate the return on preferred stock, and beta is used to compute the return on common stock. When market prices for bonds increase, the aftertax cost of debt increases. O You can't use WACC unless the company issues both common and preferred stock. When computing WACC, take the higher estimate if you have both the dividend growth and the security market line's costs of equity. A firm's investment options will become more attractive if it's WACC decreases