All of the following statements regarding capital market theory are correct EXCEPT

a) the capital asset pricing model (CAPM) allows an analyst to measure the relevant risk of an individual security as well as to assess the relationship between the risk and returns expected from investing

b)the capital asset pricing model (CAPM) relates the required rate of return for any security to the risk for that security as measured by beta

C)the market portfolio is the portfolio of all risky assets, with each asset weighted by the ratio of its market value to the market value of all risky assets the capital market line

D)(CML), also known as the security market line, is the trade-off between expected return and risk only for efficient portfolios