Suppose you can choose from two securities, a risk-free T-bill with 6% expected return and a risky stock with 10% expected return and 15% standard deviation. Your utility is determined by the following function: Suppose you are a risk averse investor and your risk aversion coefficient is A-2. Which security do you prefer? a. T-bill, due to its lower risk b. T-bill, due to its higher utility. c. Stock, due to its higher return. d. Stock, due to its higher utility e. Cannot be determined by the given information