26) . Assume that interest rates, op 20-yout Troped corporate bonds are as follows: T-bond 9.72% 40% BAB - 10.18% 7.72% 9112% 9.64% (0.18% The differeoons to these rates were probably capoed primarily by: 4. Text effoote. b. Default and liquidity risk differences: c. Maturity riak differences. d. Inflation difference e. Real risk-free rule differences