E8B10:What is frequency division multiplexing (FDM)?

Direct answer summary (2024-2028 NCVEC pool)

The official correct answer for E8B10 is Dividing the transmitted signal into separate frequency bands that each carry a different data stream.

The key fact is Dividing the transmitted signal into separate frequency bands that each carry a different data stream. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.