In technology , the channel refers to the carrier frequency band. Multiple signals are arranged on t

[单选]

In  technology , the channel refers to the carrier frequency band. Multiple signals are arranged on the carrier.frequency  band  according to multiplexing rules through carrier  modulation  so  that  multiple signals  can be transmitted at the same time.（）

• A、TMD

• B、FDM

• C、TDD

• D、FDD