E2B06

What is vestigial sideband modulation?

1. AAmplitude modulation in which one complete sideband and a portion of the other are transmitted
2. BA type of modulation in which one sideband is inverted
3. CNarrow-band FM modulation achieved by filtering one sideband from the audio before frequency modulating the carrier
4. DSpread spectrum modulation achieved by applying FM modulation following single sideband amplitude modulation

Pick an answer to check it.