A unity feed back closed loop system has open loop transfer function G(s)=K/{s(s^2+8s+25)}. At some value of K the system becomes oscillatory. What will be the values of K and frequency of oscillation?

A)150, 5 rad/sec 
B)200, 10 rad/sec 
C)200, 5 rad/sec 
D)150, 10 rad/sec


Answer : C)200, 5 rad/sec