Q5. Portfolio Theory: Discuss the followings in the context of portfolio theory, developed by Harry Markowitz: a) What is meant by a risk-averse investor? b) What is meant by a Markowitz efficient frontier? c) Explain why not all feasible portfolios are on the Markwitz frontier. d) What is meant by an optimal portfolio, and how it is related to an efficient portfolio? e) How does an investor select an optimal portfolio? Explain the role of an investor's preference in selecting an optimal portfolio. f) Explain the critical role of the correlation between assets in determining the potential benefits from diversification. g) What have been the major impediments to applying the mean-variance framework in practice