Which statement(s) below is (are) correct about the optimal risky portfolio? 1. It is the portfolio with the lowest variance on the efficient frontier II. It is the portfolio with the highest expected return on the efficient frontier III. It is the tangency point of the line originating from the risk free rate with the efficient frontier IV. Different investors will choose different optimal risky portfolios depending on their own risk aversion Ill only I, II, and III Il d III II, III, and IV