In the Capital Asset Pricing Model (CAPM),the Term Beta $\beta$ ,Is
A)a Measure of Systematic Risk Inherent in a Security

In the Capital Asset Pricing Model (CAPM) ,the term Beta, $\beta$ ,is

A) a measure of systematic risk inherent in a security.
B) calculated as the "covariance of future returns between a specific security and the market portfolio" divided by the "variance of returns of the market portfolio".
C) both a) and b)
D) none of the above