E8B07:Orthogonal frequency-division multiplexing (OFDM) is a technique used for which types of amateur communication?
Direct answer summary (2024-2028 NCVEC pool)
The official correct answer for E8B07 is Digital modes.
The key fact is Digital modes. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.