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For the feedback system given below, the transfer function $G(s)=\frac{1}{(s+1)^2}$. The system $\text{CANNOT}$ be stabilized with

  1. $C(s)=1+\frac{3}{s}$
  2. $C(s)=3+\frac{7}{s}$
  3. $C(s)=3+\frac{9}{s}$
  4. $C(s)=\frac{1}{s}$
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