Which of the following is true about the PBC theory? a. Although there is wide (but not universal) agreement that aggregate economic conditions affect election outcomes in Canada, there is significant disagreement about whether there is opportunistic manipulation that can be observed in the macro data. b. This separation of monetary policy from the direct control of elected officials is sometimes, but not always crucial. c. PBC models rarely depend on the interaction between the incumbent politician who can influence fiscal policy and an independent central bank that controls monetary aggregates and interest rates, but may be pressured to accommodate fiscal shocks. d. All of these statements are true. e. All of these statements are false