Which one of the following statements describes overall risk? A. Also known as diversifiable risk, is the practice of investing in a variety of diverse assets as a mean of reducing risk. B. Also known as market risk, is the risk that affects a large number of assets or the entire market; measured by beta. Aso known as unique or asset-specific risk, is the risk that affects an individual security or a small number of securities. D. Also known as total or aggregate risk, iscludes systematic and unsystematic risk, it is measured by the standard deviation of returns. E. Also known as riak premium, is the cocess return with respect to the risk-free rate