The portfolios identified below are being considered for investment. During the period under consideration, the risk-free rate, Rt, is estimated as 3%. Portfolio Beta Return 16% 1.0 B 22% 1.5 Standard Deviation 15% 10% 8% 12% 11% 0.6 18% 1.1 Using the Sharpe ratio, which portfolio had the best performance? Select one: . 00 O b. A O O c. D d. C e. It depends on what Sharpe ratio is