Read the given paragraph and answer the following questions.

National income reflects the monetary value of all goods and services produced within a country over a fiscal year, serving as a crucial indicator of economic health and progress. It derives from the collective contributions of land, labor, capital, and organizational skills, encompassing earnings from rent, wages, interest, and profit, also known as NNP at factor cost (NNPFC). Key metrics such as GDP, NDP, GNP, and NNP offer various perspectives on economic output and ownership. In India, the National Statistical Office (NSO) spearheads national income estimation, utilizing methods like the Product, Income, and Expenditure Methods. National income calculation excludes taxes, depreciation, and non-factor inputs, instead focusing on consumption, government expenditure, investments, net exports, and production by national residents both domestically and abroad, minus the domestic production by non-residents. The evolution of national income is essential for assessing a country’s developmental trajectory.