4. (a) Briefly discuss the Sharpe, Treynor, and Jensen measures of portfolio performance evaluation, and the situations in which each measure is the most appropriate measure. (b) With the following details evaluate the performance of the different funds by using Sharpe, Treynor and Jensen methods with RF = 5%. O Funds Return% SD% Beta A 2 20 0.90 B 12 18 0.95 C 8 22 1.20 D 9 24 1.25 Market 10 20 1.00