AEA 45? AE3 AEZ AE1 Planned aggregate expenditure 6000 5500 5000 4500 4000 $ 3500 3000 0 3000 4000 5000 6000 Aggregate output If expenditures are as shown by AE2, the equilibrium income level is Select one: O a. 6,000 b. 3,000 O C. 4,000 O d. 5,000