Which one of these bonds has the highest duration, ceteris paribus (other features are the same)? A 10-year bond with a coupon rate of 5% A 10-year bond with a coupon rate of 10% A 20-year bond with a coupon rate of 5% . A 20-year bond with a coupon rate of 10% d. IV b. II e. Not enough information a. I c