Suppose that Federal Reserve actions have caused a decrease in the risk$-$free rate.IRF. Meanwhile, the market risk premium, $($rM $-$ fRE$),$ has decreased as well. Under these conditions, with other things held constant, which of the following statements is most correct?$8--912--15--18-$a$)$ The prices of all stocks would increase, but the percent changes in stock prices would be greatest for high$-$beta stocks.b$)$Stocks$\text{'}$ required returns would change, but so would expected returns, and the result would be no change in stocks' prices.O c$)$c$)$ The required return on all stocks would increase, but the increase would be greatest for stocks with betas of less than $1\mathrm{.}0.$d$)$ The prices of all stocks would increase, but the percent changes in stock prices would be greatest for low$-$beta stocks.O e$)$ The prices of all stocks would decline, but the decline would be greatest forhigh$-$beta stocks.