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The open loop transfer function of a unity gain negative feedback system is given by $G\left ( s \right ) = \dfrac{k}{s^{2}+4s-5}$. The range of $k$ for which the system is stable, is

  1. $k> 3$
  2. $k< 3$
  3. $k> 5$
  4. $k< 5$
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