Explanation:

- National Income:

- This refers to the total value of all goods and services produced by a nation in a specific period.

- It reflects the economic performance and health of a country.

- Full Employment:

- A condition where all eligible individuals who want to work at prevailing wage rates can find employment.

- It is an important goal of macroeconomic policy.

- Total Production:

- Represents the overall output of goods and services in an economy.

- It assesses how much an economy can produce, contributing to its growth prospects.

- Correct Answer: All of these:

- All of these aspects—National Income, Full Employment, and Total Production—are key components studied under macroeconomics.