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The appropriate feedforward compensator, $G_{ff}$, in the shown block diagram is

- $G_{ff} = \dfrac{2}{3}\dfrac{\left ( 8s + 1\right )}{\left ( 5s + 1\right )}$

- $G_{ff} = -\dfrac{2}{3}\dfrac{\left ( 8s + 1\right )}{\left ( 5s + 1\right )}$

- $G_{ff} = \dfrac{3}{2}\dfrac{\left ( 5s + 1\right )}{\left ( 8s + 1\right )}e^{-s}$

- $G_{ff} = -\dfrac{3}{2}\dfrac{\left ( 5s + 1\right )}{\left ( 8s + 1\right )}e^{-s}$