27. Which of the following would an investor choose to immunize a bond portfolio over a specific investment time horizon? 1. Match the maturity of each bond in the portfolio to the investment time horizon 2. Attempt to eliminate the interest rate risk of the portfolio over the investment time horizon 3. Increase the coupon rate of each bond in the portfolio over the investment time horizon 4. Match the average weighted duration of the portfolio to the investment time horizon A. 1 and 2 B. 1 and 3 C. 2, 3, and 4 D. 2 and 4