Given that \(G=\) forward path given 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) \(1+G H\)

(b) \(1-G H\)

(c) \(G H\)

(d) \(1 / G H\).