If the value of transmissibility is to be kept less than unity which one of the following is correct in
respect of the minimum value of frequency ratio $\left ( \omega /\omega _{n} \right )$ in a vibration isolation system?
(a) > 1 (b) 
$> \sqrt{2}$
(c) $> \sqrt{3}$ (c) $> \sqrt{5}$