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The transfer function $\dfrac{V_{2}(s)}{V_{1}(s)}$ of the circuit shown below is

1. $\frac{0.5s+1}{s+1} \\$
2. $\frac{3s+6}{s+2} \\$
3. $\frac{s+2}{s+1} \\$
4. $\frac{s+1}{s+2}$