Which among the following equation is correct1. GDP = GNP + X - M2. GNP = GDP + X - M3. GNP = GDP + NFIA4. NNP = GNP - Depreciation.Select the correct answer using the codes given below.

Which among the following equation is correct1. GDP = GNP + X - M2. GN

1.	Which among the following equation is correct1. GDP = GNP + X - M2. GNP = GDP + X - M3. GNP = GDP + NFIA4. NNP = GNP - Depreciation.Select the correct answer using the codes given below.
A.	1 and 2
B.	1, 2 and 3
C.	2, 3 and 4
D.	1, 3 and 4
Answer» D. 1, 3 and 4