The following information refers to a and b. Consider two utility maximising investors. A and B, whose preferences are described as EU, re - where e, denotes expected return on the investors portfolio, , denotes the standard deviation of returns, and is investors risk tolerance, i = A,B Suppose that the optimal portfolio for investor A has an expected return of 12 percent and standard deviation of return of 12.8 percent and that the optimal portfolio for investor B has an expected return of 7 percent and standard deviation of return of 4.8 percent. The market portfolio lus an expected rate of return of 10 percent. a) To construct the optimal portfolio mentioned above, investor A The Sharpe ratio for any portfolio on the capital allocation lines c) Regarding the risk tolerance parameter, which of the following a correct expected retum of 7 percent and standard deviation of return of 4,8 percent. The market portfolio has an expected rate of return of 10 percent. a) To construct the optimal portfolio mentioned above, investor A b) The Sharpe ratio for any portfolio on the capital allocation line sells short the market portfolio and invest more than her wealth inwests a fraction of the wealth in the risk-free asset and a fraction in the market portfolio c) Regarding the risk tolerance parameter to which of the following invests all the wealth in the market portfolio borrows at the risk-free rate to invest more than her wealth in the market portfolio none of the above b) The Sharpe ratio for any portfolio on the capital allocation line is: . . c) Regarding the risk tolerance parameter tr, which of the following i 0.425 0.525 0.625 0.725 none of the above b) The Sharpe ratio for any portfolio on the capital allocation line is: > c) Regarding the risk tolerance parameter t;, which of the following is correct: IA > B LA