20. Consider the following block diagram in th...

20. Consider the following block diagram in the figure.

The transfer function \(C(s)\over R(s)\) is

 

(A) \(G_1G_2\over {1+G_1G_2}\)

(B) G1G2+G1+1

(C) G1G2+G2+1

(D) \(G_1\over1+G_1G_2\)

Hint: 

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