According to the expenditure approach, if Y is GDP, C is consumption, I is investment, G is government purchases, and NX is net exports, the national income identity can be written as:_____

a. Y = C + I + G
b. Y + C = I + G + NX
c. Y = C + I + G + NX
d. Y = (C + I + G) / NX
e. Y = C + I + G - NX