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Consider the block diagram in the figure with control input $u$, disturbance $d$ and output $y$. For the feedforward controller, the ordered pair $(K, \alpha / \beta)$ is

  1. $(0.5,2)$
  2. $(-0.5,0.5)$
  3. $(-2,2)$
  4. $(2,0.5)$

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