Investors are able to lend at a risk-free rate but cannot borrow. They can invest in portfolios of stocks listed on the ASX. Which of the following is TRUE? O a. All investors will hold the market portfolio b. Investors that want to lend will all hold portfolios on different parts of the efficient frontier Oc Investors that want to borrow at the risk-free rate will maximise the Sharpe ratio to select their optimal risky portfolio Od Investors that want to lend at the risk-free rate will maximise the Sharpe ratio to select their optimal risky portfolio pdf