Explanation:

- Public Expenditure: Government spending on goods, services, and public works to stimulate economic activity or provide public utility.

- Taxation: The process where the government imposes financial charges on individuals or entities to generate revenue and fund public initiatives.

- Public Debt: Borrowing by the government to cover expenditures exceeding tax revenues.

- Fiscal measures encompass tools used to influence a nation's economic conditions.

Option:4 - All of these: Each component plays a role in fiscal policy by impacting economic growth and stability, making option 4 correct.