The Worst Case Signal-To-Noise Ratio at the Output of an FM

Multiple Choice

The worst case signal-to-noise ratio at the output of an FM detector occurs when:

A) the desired signal is 90 degrees out of phase with the intelligence signal.
B) the desired signal is 90 degrees out of phase with the resultant signal of adding the signal to the noise.
C) the noise signal is 90 degrees out of phase with the resultant signal of adding the signal to the noise.
D) the desired signal is 90 degrees out of phase with the noise signal.