Consider the following asymptotic Bode magnitude plot ($\omega$ is in rad/s).
Which one of the following transfer functions is best represented by the above Bode magnitude plot?
- $\dfrac{2s}{(1+0.5s)(1+0.25s)^{2}} \\$
- $\dfrac{4(1+0.5s)}{s(1+0.25s)} \\$
- $\dfrac{2s}{(1+2s)(1+4s)} \\$
- $\dfrac{4s}{(1+2s)(1+4s)^{2}}$