Explanation:

- National income can be measured using different methods that assess different aspects of the economy.

- Production Method: Also known as the output method, this calculates the total value of goods and services produced in a country within a specified period.

- Income Method: This approach sums up all the incomes earned by individuals and businesses, including wages, rents, interests, and profits.

- Expenditure Method: This method focuses on total spending in the economy, summing up consumption, investment, government spending, and net exports.

All of the above methods are used for measuring national income.