2 . The foundation of the IS curve is the equation which is the 2 . Y = C + + 6 + EX - IM national income identity b . Y + IM , = Ofthe + C + EX i national income identity C . Y 1 = Ctl + Ggi national income identity d . P . = C. the + G . + EX - IM . current account e . a and bare correct