What is the required rate of return for the XYZ, Inc., which holds four stocks? The market's required rate of return is 15.0%, the risk-free rate is 7.0%, and the fund's assets are as follows: Stock Investment Beta One $ 200,000 1.50 Two 300,000 -0.50 Three 500,000 1.25 Four 1,000,000 0.75 a) 11.23% b) 11.82% Oc) 12.45% d) 13.10%