A narrowband FM does not have the following feature

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A narrowband FM does not have the following feature—

1. it has two sidebands
2. both sidebands are equal in amplitude
3. both sidebands have same phase difference with respect to carrier
4. it does not show amplitude variations

Correct Option: C

In narrow band FM the lower sideband is negative, i.e. 180° out of phase as compared to the carrier. This makes the amplitude of FM approximately constant. Hence alternative (C) is most suitable choice.