You believe that Ace stock is mispriced. The stock has a beta of $1\mathrm{.}2$ and you believe the stock will provide a return of $14\%$ this year. T$-$bills are paying $4\%$ and the market portfolio is paying $12\%.$ Given this data, which one of the following statements is correct? $($Think about this one$)$

a$.$ You should buy Ace stock because its expected return is higher than the return on the market portfolio, ensuring that it will make money.

b$.$ You should buy Ace stock because it is undervalued.

c$.$ You should sell Ace stock because its required return is only $13\mathrm{.}6\%.$

d$.$ You should sell Ace stock because its return per unit of risk is lower than for the market.