If block diagrams of the given figure (a) and (b) are to be equivalent

1.	If block diagrams of the given figure (a) and (b) are to be equivalent, then
A.	G2 = G1
B.	G2 = -G1
C.	G2 = 1/G1
D.	G2 = -1/G1
Answer» B. G2 = -G1

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