When should inbound information be forwarded to approach control?

The correct answer is that inbound information should be forwarded to approach control before the transfer of control point. This is crucial for ensuring a seamless transition of communication and control from en-route facilities to approach control. By forwarding the inbound information early, approach control can adequately prepare for the aircraft's arrival, ensuring that they have all necessary details such as the aircraft's position, intentions, and any pertinent data about its flight. This proactive communication allows approach controllers to manage air traffic efficiently and ensures that the incoming aircraft is integrated into the flow of traffic safely.

The other options suggest actions that would not sufficiently provide approach control with the necessary situational awareness in a timely manner. For instance, forwarding the information as soon as the aircraft enters controlled airspace does not allow sufficient time for approach control to react to the aircraft's presence. Waiting until after the aircraft has landed doesn't serve any purpose in managing the approach or landing safely. Finally, passing information immediately upon the aircraft's arrival is too late for effective integration into the approach sequence. Therefore, timely forwarding of inbound information prior to control transfer is critical for airspace safety and efficiency.