What Is the Key Difference Between the Aggregate Expenditure Model

What is the key difference between the aggregate expenditure model and the aggregate
Demand/aggregate supply model?

A) the aggregate expenditure model assumes that real GDP is fixed
B) monetary and real factors interact in the aggregate demand/aggregate supply model
C) the aggregate expenditure model examines monetary policy whereas the aggregate demand/aggregate supply model does not
D) the aggregate demand/aggregate supply model assumes that the price level is fixed
E) the aggregate expenditure model assumes that the price level is fixed