Which of the following is true when the aircraft database information cannot be changed?

When the aircraft database information cannot be changed, it indicates a lack of track control within the sector. Track control refers to the ability to manage and modify flight paths and associated data, which allows for real-time adjustments based on current conditions and aircraft movements. If the aircraft database is static and cannot be updated, it means that the sector cannot actively control or respond to the flight's trajectory. This limitation can hinder effective air traffic management, particularly regarding safety and efficiency in navigating aircraft.

The other options suggest circumstances that would not apply when database information is unchangeable. For example, having current data or being able to update flight data would inherently conflict with the situation of an unchangeable database. Thus, the insight lies in understanding that effective airspace management relies on the ability to adaptively track and control flights, emphasizing the importance of having dynamic data.