**Suppose the unit step response of a feedback control system is y(t)=(1-e(-2t+1))u(t). if the settling time 1, = 4 sec. and P.O> 0%, then answer the following three questions. Q22. The value if a is (a) 2.53 (b) 1.85 (c) 2.46 (d) 1.95 Q23. The value of peak overshoot time t, is (e) 3.25 (f) 2.1 (g) none (a)2.183 sec. (d) 0.5915 sec. (e) 1.7745 sec. (f) 1.733 (g) none (b) 1.183 sec. (c) 0.813 Q24. The percent peak overshoot is (a) 4.32% (b) 16.32% (c)24.2% (d) 32.5% (e) 9.52% (1) 17.32% (g) none