Option 1: Personal Income -> This is income received by households, derived from National Income with further adjustments.
Option 2: Gross National Income -> This is GNP at market prices, not the result of subtracting net indirect taxes from NNP.
Option 3: Gross Domestic Product -> This measures domestic production value, unrelated to this formula.
Option 4: National Income -> NNP at market prices minus net indirect taxes gives NNP at factor cost, which equals National Income.
Hence, Option 4: National Income -> When we subtract net indirect taxes (Indirect taxes - Subsidies) from NNP at market prices, we convert it to NNP at factor cost. NNP at factor cost represents the actual income earned by factors of production and is known as National Income. This conversion removes the distortion caused by government taxation and subsidies to show the true factor earnings -> correct