4. In each of the following scenarios, which security should an investor buy? Assume that the securities are identical in all ways except as described below. Explain your answer. a. Security A has an expected return of 12 percent, whereas security B has an expected return of 10 percent. b. Interest on security C is 10 percent and is taxable, whereas interest on security D is 7 percent and is not taxable, and the investors tax rate is 40 percent. c. Security E has a 20 percent chance of default, whereas security F has a 15 percent chance of default. d. Security G and security H are both debt securities that cost $1,000 and mature in one year. An investor incurs a transactions cost of $50 to purchase security G, which has an expected return of 8 percent. An investor incurs no transactions cost to purchase security H, which has an expected return of 5 percent.