1.

Let Y(s) be the unit-step response of a causal system having a transfer function\(G\left( s \right) = \frac{{3 - s}}{{\left( {s + 1} \right)\left( {s + 3} \right)}}\)that is, \(Y\left( s \right) = \frac{{G\left( s \right)}}{S}\). The forced response of the system is

A. u(t) – 2e -t + e-3t u(t)
B. 2 u(t) – 2e -t + e-3t u(t)
C. 2u(t)
D. u(t)
Answer» E.


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