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The transfer function of a phase-lead compensator is given by
\[G_{c}(s)=\frac{1+3 T s}{1+T s} \text { where } T>0\]
The maximum phase-shift provided by such a compensator is

  1. $\frac{\pi}{2}$
  2. $\frac{\pi}{3}$
  3. $\frac{\pi}{4}$
  4. $\frac{\pi}{6}$
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