An underdamped second order system having a transfer function of the form (mathrm{M}(s)) (=frac{K omega_{n}^{2}}{s^{2}+2 xi omega_{n}

Question:

An underdamped second order system having a transfer function of the form $\mathrm{M}(s)$ $=\frac{K \omega_{n}^{2}}{s^{2}+2 \xi \omega_{n} s+\omega_{n}^{2}}$ has frequency response plot as shown below, then the system gain $\mathrm{K}$ and the damping ratio approximately are
(a) $\mathrm{K}=1, \xi=0.2$
(b) $\mathrm{K}=1, \xi=0.3$
(c) $\mathrm{K}=2, \xi=0.2$
(d) $\mathrm{K}=3, \xi=0.3$.

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