Suppose that the spot interest rate on a one-year zero-coupon bond is 0.5% and the spot interest rate on a two-year zero-coupon bond is 1.5%. If you expect the one-year interest rate starting in one year to be 3.0%, what is the optimal investment strategy for a two-year investment?

a) Buy a two-year bond

b) Buy a one-year bond and plan to buy a second one-year bond next year