Question: The transfer function of a control system is given as ; (T(s)=frac{K}{s^{2}+4 s+K}). For this system to be critically damped, the value of (mathrm{K}) should

The transfer function of a control system is given as ; $T(s)=\frac{K}{s^{2}+4 s+K}$. For this system to be critically damped, the value of $\mathrm{K}$ should be:
(a) 1
(b) 2
(c) 3
(d) 4

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