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The driving-point impedance $Z(s)$ of a network has the pole-zero locations as shown in the figure. If $Z(0)=3$, then $Z(s)$ is

  1. $\frac{3(s+3)}{s^{2}+2 s+3}$
  2. $\frac{2(s+3)}{s^{2}+2 s+2}$
  3. $\frac{3(s-3)}{s^{2}-2 s-2}$
  4. $\frac{2(s-3)}{s^{2}-2 s-3}$
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