11. Suppose a pension fund must make a guaranteed payment to an investor in five years for $20,000, a lumpsum payout on retirement, the current market yield to maturity is assumed to be 8%. To protect itself against interest rate risk the fund wants to invest in a coupon bond with 8% annual coupon rate and $1000 face value, which of the bonds below would be the most appropriate? A. buy 12.603 units of 5 year bonds B. buy 13.612 units of 5 year bonds C. buy 13.612 units of 6 year bonds D. buy 20 units of 6 year bonds E. buy 11.669 units of 7 year bonds