For each of parts (i) and (ii) below, sketch the frequency domain representation (amplitude or power density only) and briefly comment on the bandwidth requirements. i.A periodic signal that can be represented as the sum of four sine waves with frequencies of 120, 125, 130 and 140 MHz. (2 marks) ii.A signal that has a continuous frequency spectrum that extends from 135 MHz to 160 MHz. (2 marks) b.If the two signals in part (a) arrive simultaneously at the receiver, what problem could arise