Which of the following statements is (are) incorrect? 1. Yield curves are plotted with yields on the y (vertical) axis and risk premiums on the x (horizontal) axis. II. The price of a bond is equal to the present value of the bond's future cash flows. III. When the market rate of interest is higher than a bond's coupon rate, the bond will sell at a discount. IV. If you feel interest rates are going to drop significantly, you could potentially realize large capital gains by purchasing long-term zero coupon bonds prior to the rates decreasing