Answer:
I and IV are correct.
Step-by-step explanation:
The reduction in the personal taxes and in the Social Security withholding taxes are considered as the expansionary fiscal policy. Fiscal policy refers to a policy that is used by the government for monitoring and influencing a nation's economy. Government adjust the expenditure, investment and taxes for maintaining the stability in an economy.
If there is a fall in level of tax rate then this will increase the disposal income of the consumers and hence, an increase in the aggregate demand. Therefore, there is a rightward shift in the aggregate demand curve.
Expansionary fiscal policies refers to the policies which increases the aggregate demand in an economy.