Consider a unity-gain negative feedback system consisting of the plant $G(s)$ (given below) and a proportional-integral controller. Let the proportional gain and integral gain be $3$ and $1,$ respectively. For a unit step reference input, the final values of the controller output and the plant output, respectively, are
$$G(s)=\frac{1}{s-1}$$
- $\infty, \infty$
- $1,0$
- $1,-1$
- $-1,1$