During ARQ communications, A Coast station will likely break the phased radio connection:

Correct Answer: Option D — If any of the above actions takes place.

The coast station controller monitors the link for protocol compliance and signal quality. If the error rate becomes excessive, or if the operator sends an improper command like 'BRK+' during an active session, or interrupts the automated answerback sequence, the station will automatically break the phased radio connection to clear the channel for others.