QUESTION 23 In the more general form of a multi-index model, in which expected retums of a securitycan be expressed as R,= a;+bal + bizl2 + b3/3 +...+b;', +C; what is the expected value of c? (In other words, what is E[ci]?) QUESTION 24 Beta is a measure of a firm's: Covariance Unsystematic Risk O Correlation Total Risk Systematic Risk