Given that \(G=\) forward path gain and \(H=\) feed back path gain, if \(G\) and \(H\) are functions of frequency, then the feedback would affect gain \(G\) of a non-feedback system by a value to

(a) \(1+\mathrm{GH}\)

(b) \(1-\mathrm{GH}\)

(c) \(\mathrm{GH}\)

(d) \(1 / \mathrm{GH}\)