The statement that the Capital Market Line (CML) is also called the Security Market Line (SML) is incorrect. While both the CML and SML are fundamental concepts in modern portfolio theory and are used to illustrate the risk-return tradeoff in financial markets, they are not the same. The CML represents the efficient frontier of a market in the presence of a risk-free asset, using standard deviation of portfolio returns as a measure of risk. On the other hand, the SML is a line that shows the systematic, or market, risk versus return of the whole market at a certain time and shows all the risk-averse market's securities. The risk measure for the SML is beta, which measures the sensitivity of a security's returns to the overall market returns. Therefore, the CML and SML are distinct concepts with different risk measures and interpretations.

Choice A is incorrect. The risk measure for the CML is indeed standard deviation. This is because the CML represents portfolios that maximize expected return for a given level of risk, and this risk is measured as standard deviation.