Question: What is the expected response from the Mobile Terminal (MT) when the 'H' command is successfully used to terminate an ongoing voice group or voice broadcast call, as per the AT command set for User Equipment (UE)?
Option 1: ERROR or +CME ERROR result code
Option 2: BUSY indication until the call is fully terminated
Option 3: OK
Option 4: RING to signal an incoming call immediately after termination
Explanation: When the 'H' command is used correctly to terminate a voice group or voice broadcast call, the Mobile Terminal (MT) responds with an OK result code, indicating successful execution of the command. This is in contrast to error scenarios where ERROR or +CME ERROR might be returned, or other unrelated responses like BUSY or RING, which do not pertain to the successful termination response.