Explanation:

- Production Method

- Also known as the value-added method.

- Measures national income based on the production of goods and services.

- Gross value of output minus intermediate consumption.

- Income Method

- Focuses on income earned by factors of production.

- Includes wages, rent, interest, and profit.

- Offers insight into the distribution of income.

- Expenditure Method

- Calculates total expenditure on the nation's final goods and services.

- Comprised of consumption, investment, government spending, and net exports.

- Highlights economic activity through expenditure patterns.

- All of these (Correct Answer)

- All three methods are used and are interrelated.

- They provide a comprehensive view of the economy.