Multiple choice

The Thevenin equivalent impedance Zth between the nodes P and Q in the following circuit is

  1. 1
  2. 1 + s + $\dfrac{1}{s}$
  3. 2 + s + $\dfrac{1}{s}$
  4. $\dfrac{s^2 + s + 1}{s^2 + 2s +1}$
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