Suppose a recession is caused by both a fall in aggregate demand and a supply shock. What happens to real GDP in the short run?

a.$.$

Real GDP decreases.

b.$.$

Real GDP may decrease if the fall in aggregate demand is larger than the fall in short−$-$run aggregate supply or increase if the fall in aggregate demand is smaller than the fall in short−$-$run aggregate supply.

c.$.$

Real GDP increases.

d.$.$

Real GDP may increase if the fall in aggregate demand is larger than the fall in short−$-$run aggregate supply or decrease if the fall in aggregate demand is smaller than the fall in short−$-$run aggregate supply.