E2B06:What is vestigial sideband modulation?

Direct answer summary (2024-2028 NCVEC pool)

The official correct answer for E2B06 is Amplitude modulation in which one complete sideband and a portion of the other are transmitted.

The key fact is Amplitude modulation in which one complete sideband and a portion of the other are transmitted. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.