Which of the following best describes DMR (Digital Mobile Radio)?
A. A technique for time-multiplexing two digital voice signals on a single 12.5 kHz repeater channel.
B. An automatic position tracking mode for FM mobiles communicating through repeaters.
C. An automatic computer logging technique for hands-off logging when communicating while operating a vehicle.
D. A digital technique for transmitting on two repeater inputs simultaneously for automatic error correction.