For a quadratic factor in denominator of transfer function the phase angle at corner frequency (in Bode phase angle plot)

For a quadratic factor in denominator of transfer function the phase a

1.	For a quadratic factor in denominator of transfer function the phase angle at corner frequency (in Bode phase angle plot)
A.	is -90°
B.	is +90°
C.	depends on the damping factor
D.	none of the above
Answer» B. is +90°