Which statement is true? a. The framers did not expect much interaction between the state and federal governments. b. One of the strengths of the Constitution is its lack of ambiguity. c. According to the Constitution, the federal government may issue bills of attainder and make ex post facto laws, but state governments may not. d. One of the federal government's enumerated powers was the power to permit slavery. e. all of the above f. none of the above