Helena owns a complete portfolio containing a risky portfolio (R) and a risk-free asset. If the Sharpe ratio for the complete portfolio is 1.5, and the risk premium for portfolio R is 7.5%, which of the following is the best answer? Select one a The Sharp ratio for portfolio R is 1.5 b. The standard deviation of the returns for portfolio R is 5% calf the risk-free rate is 3%, the expected return for portfolio R is 10.5% d. All the above choices are correct o