Mike is saving for his child's education, which is approximately 4 years from now. Which of the following bonds should Mike invest in to immunize his portfolio? Bond A: AAA rate, 5-year maturity, 3.86 duration, 11% coupon, selling for $954. Bond B: AA rated, 4-year maturity. 3.2 duration, 12.5% coupon selling for $982. Bond C: A rated, zero-coupon, 5-year maturity, selling for $575. Bond A, because its duration matches the goal time frame. Bond C, because it's a zero coupon, it's duration is 5 years. Bond A, because it has a higher credit rating than Bond B. Bond B, because its maturity matches the goal time frame