E7E04: What is one way to produce a single-sideband phone signal?

Direct answer summary (2024-2028 NCVEC pool)

The official correct answer for E7E04 is Use a balanced modulator followed by a filter.

The key fact is Use a balanced modulator followed by a filter. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.