11 Answer questions 10 and 11 based upon the following information: Assume investors are allowed to choose from among only the following risky portfolio Expected return Standard deviation Portfolio A Portfolio B Portfolio C Portfolio D Portfolio E 15% 25% 25% 35 % 20% 20% 25% 25 % 35% Q 10. The efficient set of portfoliosis a. b. c. A null set (none of the portfoliosae efficient). Made up of only portfolios B and D Made up of only portfolios Cand E Made up of all the portfolios, A through E. Q 11. If there is a risk-free asset with a retum of 10%, then the best risk return tradeoff is obtained by combining the risk-free asset with b. Portfolio B Portfolio C Portfolio D. Portfolio E