If you have a degree of risk aversion of 4, the risk-free rate of returns is 4% and the expected return on your portfolio is 13%, what is the standard deviation of your portfolio? O a. a. 15.00% O b. 2.25% O C. 20.61% O d. 4.25% 17-If the standard deviation of the expected return of the available risky portfolio is 40%. Assume your degree of risk aversion is 2, and you decide to invest 25% of your portfolio in the available risky portfolio, what is the expected risk premium of the available risky portfolio? a. 50% KA Ecrms re. 6 20% . 8%