Explanation:

- Public Expenditure: This is a key component of fiscal policy. It refers to government spending on goods and services, and it influences economic activity.

- Tax: Taxes are another crucial element. They are the means by which a government finances its expenditure by imposing charges on citizens and businesses.

- Public Debt: This involves borrowing by the government to finance deficits if expenditure exceeds tax revenue. It plays a role in fiscal policy decisions.

- All of these: Fiscal policy comprises public expenditure, tax policy, and public debt management to influence the economy.

All of these include elements of fiscal policy.