(4 points each) For each of the design requirements below, shade the region of the complex-plane where the poles of the transfer function should lie. (a) The transfer function must be stable. 3 2 Im 1 0 -1 -2 -3 -5 -4 -3 -2 -1012345 (b) The settling-time of step-response must less than 1 seconds. 3 2 Im 1 0 -1 -2 -3 -5 -4 -3 -2 -1012 3 4 (c) The overshoot of the step-response should be less 16.3%. 3 2 Im 1 0 -1 -2 -3 -5 -4 -3 -2 -101 2 3 4 5 Re Re Re