This question is similar to the previous one and covers the scope of macroeconomics. Macroeconomics is concerned with the aggregate (total) variables of an economy.
National Income: The total income earned by the residents of a country.
Full Employment: The level of employment where all willing and able individuals can find jobs.
Total Production: The aggregate output of all goods and services in the economy (GDP/GNP).
All these are fundamental concepts studied in macroeconomics.