What is the overall transfer function (C/R) of the following block diagram if G

Question

What is the overall transfer function (C/R) of the following block diagram if G = G1. G2. G3 and H = H1.H2 ?

Options:

A . 1/(1 + GH)

B . G/(1 + GH)

C . H/(1 + GH)

D . G/(1 – GH)

Answer: Option B
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