12. Assume that the CAPM is a good description of stock price returns. The market expected return is 8% with 10% volatility and the risk-free rate is 2%. New news arrives that does not change any of these numbers, but it does change the expected return of the following stocks: Expected Return Volatility Beta Green Leaf 14.0% 25% 1.65 NatSam 11.9% 37% 1.70 HanBel 11.0% 28% 0.85 Rebecca Automobile 9.0% 31% 1.35 a. At current market prices, which stocks represent buying opportunities? b. On which stocks should you put a sell order in