5. Consider a composite periodic signal where the fundamental frequency is 20KHz with amplitude of 945 and the highest existing frequency is 190KHz. (20 marks) a. Write the signal in the sinusoidal form. Consider the phase component is zero for all frequencies. b. Draw the signal in the frequency domain. To make your task easier, do not consider the term. c. Calculate the bandwidth of the signal. d. Why such signal is preferred for the digital communication.