What information must ground control provide when an aircraft has taxied to a non-active runway?

When an aircraft has taxied to a non-active runway, it is essential for ground control to notify local control of this action. This communication ensures that local control is aware of all aircraft positions on the airfield, including those on non-active runways, to maintain safety and prevent potential conflicts with other aircraft or operations that may be happening. Proper coordination between ground control and local control is crucial for managing air traffic effectively, especially in busy terminal environments where multiple movements may be occurring simultaneously.

Other choices, such as providing flight numbers, pilot contact information, or details about the aircraft's weight, are not necessary for the immediate safety and operational considerations associated with an aircraft's position on a non-active runway.