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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

  1. $\frac{2 \alpha}{\mathrm{k}}$
  2. $\frac{\alpha}{\mathrm{k}}$
  3. $\frac{\alpha}{2 \mathrm{k}}$
  4. $\frac{\alpha}{4 \mathrm{k}}$

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