help please

help please!!

Which of the following statements is true of optimal portfolios when investors can lend or borrow in a risk-free asset. Note: "expected excess return" means the expected return minus the risk-free rate. Having the highest expected excess return among all possible portfolios Having the highest ratio of expected excess return to standard deviation of return among all possible portfolios Having the lowest standard deviation of return among all possible portfolios Having the highest expected retum among all portfolios with the lowest possible standard deviation of returns Which of the following statements is true of optimal portfolios when investors can lend or borrow in a risk-free asset. Note: "expected excess return" means the expected return minus the risk-free rate. Having the highest expected excess return among all possible portfolios Having the highest ratio of expected excess return to standard deviation of return among all possible portfolios Having the lowest standard deviation of return among all possible portfolios Having the highest expected return among all portfolios with the lowest possible standard deviation of returns