The overall closed loop transfer function $\frac{C(s)}{R(s)}$ ,represented in the figure, will be
- $\frac{(G_1(S)+G_2(S))G_3(S)}{1+(G_1(S)+G_2(S))(H_1(S)+G_3(S))}$
- $\frac{(G_1(S)+G3(S))}{1+G_1(S)H_1(S)+G_2(s)G_3(S)}$
- $\frac{(G_1(S)-G_2(S))H_1(S)}{1+(G_1(S)+G_3(S))(H_1(S)+G_1(S))}$
- $\frac{G_1(S)G_2(S)H_1(S)}{1+G_1(S)H_1(S)+G_1(S)G_3(S)}$