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A system described by the transfer function

$\mathrm{H}(s)=\frac{1}{s^{3}+\alpha s^{2}+k s+3}$ is stable. The constraints on $\alpha$ and $k$ are

  1. $\alpha>0, \alpha k<3$
  2. $\alpha>0, \alpha k>3$
  3. $\alpha<0, \alpha k>0$
  4. $\alpha>0, \alpha k<0$
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