The system with the open loop transfer function G(s) H(s) =1/s(s^2+s+1) has the gain margin of :

The system with the open loop transfer function G(s) H(s) =1/s(s^2+s+1

1.	The system with the open loop transfer function G(s) H(s) =1/s(s^2+s+1) has the gain margin of :
A.	-6 dB
B.	0 dB
C.	3.5 dB
D.	6 dB
Answer» C. 3.5 dB