4. Below are two portfolios with a market value of $500 million. The bonds in both port- folios are trading at par value. The dollar duration of the two portfolios is the same Years to Matu Par Value (in millions) Bonds Included in Portfolio I 2.0 2.5 20.0 20.5 $120 $130 $150 $100 Bonds Included in Portfolio II 9.7 10.0 10.2 $200 $230 S 70 Portfolios I and II are respectively: A. A barbell and a ladder B. A ladder and a bullet C. A bullet and a barbell D. A barbell and a bullet E. None of the above