Stock A lies above the SML. The return on the stock is more than its expected return as predicted by the CAPM. As such, the stock is undervalued and, therefore, a good buy.

Generally, assets that lie above SML are deemed undervalued, as they provide a higher expected return compared to the anticipated return for their risk level. This indicates that the asset might be underestimated by investors, creating a chance to purchase at a low price and sell at a high price. On the other hand, assets positioned below the SML are deemed as overvalued because they deliver a lower expected return than what is anticipated for their risk level. This suggests that the asset might be overestimated by investors, and it could be wise to steer clear of it or wait for its price to decrease.