Problem 3 A signal e(t) = 4 sin 7t is applied to a sampler/zero-order hold device, with ωs = 4rad/s. (a) What is the frequency component in the output that has the largest amplitude? (b) Find the amplitude and phase of that component. (c) Sketch the input signal and the component of part (b) versus time. (d) Find the ration of the amplitude in part (b) to that of the frequency component in the output at ω = 7rad/s.