Ground Control must advise Local Control when an aircraft _______.

The correct answer is based on the specific procedural requirements for communication between Ground Control and Local Control in air traffic management. When an aircraft taxis to an intersection for departure, it is a critical point in the operational sequence, as it prepares the aircraft for takeoff. This action reflects an important transition from ground movement to the imminent phase of flight, and it requires coordination to ensure that the aircraft is given the necessary clearance and that the runway is clear for departure.

The communication is essential to maintain safety, as the intersection often serves as a point of potential conflict with other taxiing aircraft or those already on the runway. It ensures that both controllers are aware of the aircraft's status, allowing for effective traffic management and minimizing the risk of incursions or other safety issues.

While other options involve movements of aircraft, they may not necessarily necessitate the same level of coordination or communication between Ground Control and Local Control that occurs when an aircraft is preparing for departure at an intersection designated for that purpose.