During a standard intercommunication call, what action signals completion?

• A. The caller ends the call.
• B. The line remains active with no response.
• C. The receiving party responds and the caller ends by replacing the handset.
• D. The supervisor acknowledges and closes the call.

Answer: (D)

Completion is signaled by the supervisor’s acknowledgment and closing of the call. In intercommunication, the line is considered finished only after someone in a supervisory role confirms that the message was received and understood, and then seals the transmission by closing the circuit. This keeps the system orderly and ensures the receiving party has been heard before the line is released for others. Ending the call unilaterally, or waiting for the line to stay active without confirmation, or relying on the recipient’s response followed by the caller replacing the handset does not provide the formal end-of-call signal required in this setup.