Which statement is true concerning the airfield?

The statement that the Localizer is unmonitored means that there is not continuous oversight or real-time monitoring of the Localizer's performance and signal quality by air traffic control. In some cases, especially during periods of low traffic or maintenance, the Localizer might operate without constant supervision. Pilots and air traffic services may need to be aware of this aspect, as it could affect approach procedures and decisions made during approaches to the airfield.

In the context of instrument flight rules (IFR), while a Localizer is important for precision approaches, it doesn't always need to be actively monitored for every operation, particularly when alternate procedures or instruments are available. This situation emphasizes the importance of understanding the limitations and operational status of navigational aids at an airfield.

Other options indicate that the Localizer is either monitored, temporarily out of service, or not required for IFR, which each imply a different operational context or status. Understanding these distinctions can help pilots make informed decisions during their approach and landing phases.