A critically damped 2nd order system has a rise time of 0.7 sec with a DC Gain of 2 units. a) Find the transfer function G(s) of the above system b) Compute the natural frequency wn of the step response for the above determined transfer function c) Compute the peak time Tp and the percent over-shoot for the step response of the above determined transfer function. d) Determine the poles and zeros of the above determined transfer function.