Considering massless rigid rod and small oscillations, the natural frequency (in rad/s) of vibration of the system shown in the figure is
1
\(\sqrt {\frac{{400}}{1}}\)
2
\(\sqrt {\frac{{400}}{2}}\)
3
\(\sqrt {\frac{{400}}{3}}\)
4
\(\sqrt {\frac{{400}}{4}}\)