Which of the following indicates uses of "National income accounting"?

National income accounting is a method of preparing and presenting national income accounts based on the principle of double entry system of business accounting. Various uses off the same are:

1. Indicates specific contribution of individual sectors of economy.
2. Helps to find out structural changes in the economy.
3. It reflects how various factors of production's share the national income.
4. It helps us to understand the working of economy.
5. It helps in comparing the national income and per capita income of India with other foreign countries.