The first three annual forward rates implied from bond prices are 2%, 3%, and 3.50%. An asset manager with an investment hortion of three years strongly believes that the 1-year rate will be 2.50% in 1 year and 3% in 2 years. Which of the following is this manager's best strategy?

a. Buy and roll 1-year bonds;

b. Buy a 2-year bond and roll into a 1-year bond;

c Buy a 3-year bond,

d. Hold cash.