单选题 Stock K has a beta of 0.7. Which of the following statements is/are true? Ⅰ. The SML required return for K should be below the expected return on the market. Ⅱ. K has above-average covariance with the market portfolio, M Ⅲ. A portfolio of 70% M and 30% risk-free asset will have the same expected return as K