Define analog and digital signals. Give examples of analog and digital communication systems, respectively. b)What type of medium is used for transmitting a WiFi signal? Determine the frequency of the following signals: v = 2 sin (2TT X 4t) vV = 3 cos (2pi X 2.5t) v = 0.5 sin (2πT X 2t) Sketch the time domain response of the following signal: (i)y = 2 sin (2pi X 0.5t) V = 5 cos (2pi X 3t) (iii)v = 1.5 cos (2pi X 2t) Sketch the frequency domain response of the following signals and indicate the bandwidth on your sketch: (i)v = 2 sin (2πT X 4t) (ii)v = 3 sin (2π x 1t) + 4 sin (2π x 3t) (iii)v = 1 sin (2πT X 4t) + 3 sin (2π x 3t) + 2 sin (2π x 5t)