Consider the following asymptotic Bode magnitude plot (ω is in rad/s).

Which one of the following transfer functions is best represented by the above Bode magnitude plot?

1. $\frac{2s}{(1+0.5s)(1+0.25s)^{2}}$
2. $\frac{4(1+0.5s)}{s(1+0.25s)}$
3. $\frac{2s}{(1+2s)(1+4s)}$
4. $\frac{4s}{(1+2s)(1+4s)^{2}}$

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