People are more optimistic about the future

Imagine that the economy is in long$-$run equilibrium. Then, perhaps because of improved international relations and increased confidence in policy makers, people become more optimistic about the future and stay this way for some time.

Question $9(1$ point$)$

Imagine that the economy is in long$-$run equilibrium. Then, perhaps because of improved international relations and increased confidence in policy makers, people become more optimistic about the future and stay this way for some time.

Which curve shifts and in which direction?

AS shifts right

AD shifts left

AS shifts left

AD shifts right