An FM signal has a center frequency of 154.5 MHz but is swinging between 154.45 MHz and 154.55 MHz at

An FM signal has a center frequency of 154.5 MHz but is swinging between 154.45 MHz and 154.55 MHz at a rate of 500 times per second. Its index of modulation is:
A) 100,000.
B) 500
C) 50,000
D) 100.

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