Which action should a technician take to comply with professional communication standards upon realizing they will arrive later than scheduled for an onsite appointment?
Sending a brief text message to the client's phone without providing a new arrival time.
Waiting to reach the client's location to apologize in person for the tardiness.
Notifying the customer immediately, explaining the reason for the delay, and giving an updated arrival time.
Calling the client after the scheduled appointment time to explain the reason for not arriving.