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The asymptotic Bode plot of a transfer function is as shown in the figure. The transfer function $G(s)$ corresponding to this Bode plot is

1. $\frac{1}{(s+1)(s+20)}$
2. $\frac{1}{s(s+1)(s+20)}$
3. $\frac{100}{s(s+1)(s+20)}$
4. $\frac{100}{s(s+1)(1+0.05 s)}$