Which of the following statements is true about using Macaulay duration to achieve interest rate immunization? A. It can let your bond portfolio beat the bond market performance. B. It can let you hedge against the credit risk of your bond portfolio. C. It is more accurate when there is a parallel shift in the yield curve. D. It is less accurate when there is a parallel shift in the yield curve. E. It is more accurate when the yield curve is more steeply sloped