When working with the CAPM, which of the following factors can be determined with the most precision? O a. The expected rate of return on the market, rM. Ob. The beta coefficient of "the market," which is the same as the beta of an average stock. O c. The most appropriate risk-free rate, rRF. O d. The market risk premium (RPM). Oe. The beta coefficient, bi, of a relatively safe stock