The closed-loop transfer function of a control system is given by
`(C(s))/(R(s))` = `(2(s - 1))/((s + 2)(s + 1))`
For a unit step input the output is
- 3 e-2t + 4 e-t - 1
- 3 e-2t - 4 e-t + 1
zero
infinity
not clear the question