Place each of the following transactions in one of the four components of expenditure: consumption, investment, government purchases, and net exports.
a. A domestic airline manufacturer sells an air-plane to the government.
b. A domestic airline manufacturer sells an airplane to a domestic airline operator.
c. A domestic airline manufacturer sells an airplane to Air France.
d. A domestic airline manufacturer sells an airplane to a Canadian golf professional.
e. A domestic airline manufacturer builds an airplane to be sold next year.