Consider the following. a. What is the duration of a four-year Treasury bond with a 4.5 percent semiannual coupon selling at par? b. What is the duration of a three-year Treasury bond with a 4.5 percent semiannual coupon selling at par? c. What is the duration of a two-year Treasury bond with a 4.5 percent semiannual coupon selling at par?

a.	Duration of the bond		years
b.	Duration of the bond		years
c.	Duration of the bond		years