4. Suppose that there are two independent economic factors, F and F2. The risk-free rate is 6%, and all stocks have independent firm-specific components with a standard deviation of 45%. Portfolios A and B are both well-diversified with the following properties: Portfolio Beta on F1 Beta on F2 Expected Return A 1.5 2.0 31% B 2.2 -0.2 27% What is the expected return-beta relationship in this economy