The following portfolios are considered for investment. Assume that the risk-free rate of 4.8% is appropriate given the inflationary conditions. Portfolio Return Beta Standard deviation A 11% 1.3 8% B 7% 0.50 4.5% C 9% 1.15 4.5% Market 6% 1.0 4.0% (i) Calculate the Sharpe ratio and Treynor's composite ratio for each of the three portfolios and the Market portfolio, rank them, and discuss the reason for any ranking conflicts