If the yield curve is upward sloping, which of the following statements is incorrect? (hint: graph the yield curves for a T-bond, a AAA bond, and a B bond) Select one: a. The yield on the 5-year T-bond must be smaller than the yield on the 10-year B corporate bond. b. The yield on the 5-year T-bond must be smaller than the yield on the 5-year AAA corporate bond. c. The yield on the 10-year T-bond must exceed the yield on a 2-year T-bond. d. The yield on the 5-year AAA corporate bond must be smaller than the yield on 5- year B corporate bond. e. The yield on the 10-year AAA corporate bond must be less than the yield on the 5- year T-bond