A closed loop system is shown in the figure where $\mathrm{k}>0$ and $\alpha>0$. The steady state error due to a ramp input $\left(\mathrm{R}(\mathrm{s})=\alpha / \mathrm{s}^2\right)$ is given by
- $\frac{2 \alpha}{\mathrm{k}}$
- $\frac{\alpha}{\mathrm{k}}$
- $\frac{\alpha}{2 \mathrm{k}}$
- $\frac{\alpha}{4 \mathrm{k}}$