"suppose hilary currently allocates 75% of her portfolio to a diversified group of stocks and 25% of her portfolio to risk-free bonds; that is, she chooses combination d. she wants to reduce the level of risk associated with her portfolio from a standard deviation of 15 to a standard deviation of 5. in order to do so, she must do which of the following? check all that apply. a. sell some of her bonds and use the proceeds to purchase stocks b. sell some of her stocks and use the proceeds to purchase bonds c. place the entirety of her portfolio in bonds d. accept a lower average annual rate of return"