An adapter cable used to connect a DMR radio to a computer for internet access
Configuration data loaded onto your radio to access repeaters and talkgroups✓Correct answer
An upgrade to DMR programming software provided by the radio manufacturer to accommodate new radio models
A Coder-Decoder (CODEC) that converts analog voice data to DMR digital data and vice versa
Explanation
A DMR code plug is the block of configuration data loaded into the radio, holding channels, frequencies, colour codes, time slots, talkgroups and contacts. It is data, not a cable, a codec or a software upgrade.