4. Consider the detection problem in the notes p.168-171 but with the threshold detector |Y | > γ =⇒ "say signal present" |Y | < γ =⇒ "say signal absent" (a) Find the probability of detection and the probability of false alarm (b) Find the probability of error. (c) Find the limiting values of the probability of error as γ → +[infinity] and γ → −[infinity].