3. Let C stand for consumption spending, I for investment, G for government purchases, X for exports, IM for imports, DI for disposable income, and NT for net taxes (question is worth 10 points). Consider the following identity C+I+G+(X-IM) = DI + NT Which of the following best characterizes the above identity? a) National income must equal domestic product b) National income must equal the total amount of leakages from the nation's flow of income and expenditures c) Domestic product must equal the total amount of injections into the nation's flow of income and expenditures. d) Domestic product must equal the total amount of leakages from the nation's flow of income and expenditures