The correct answer is B: Dividing the transmitted signal into separate frequency bands that each carry a different data stream. Frequency division multiplexing (FDM) is dividing the transmitted signal into separate frequency bands that each carry a different data stream. Each data stream occupies a different frequency range. In FDM, multiple signals are combined by assigning each to a different frequency band. These bands don't overlap, so the signals can be separated at the receiver by filtering. FDM is used in many communication systems to allow multiple users or data streams to share the same transmission medium. For example, in a repeater system, different talkgroups might use different frequency bands. FDM is an efficient way to share bandwidth among multiple signals.