Answer :
Final answer:
The Yellow X markers on a runway indicate that it is temporarily closed. The other options, such as white edge lights, green centerline lights, and red threshold lights, are used for different purposes and do not signify a closed runway.
Explanation:
In the context of airport markings, if a runway is temporarily closed, it's often indicated by Yellow X markers on the runway. Yellow X markers are used at a number of airports worldwide to show that a particular runway is closed, whether for maintenance or some other reason. These markers are usually large, highly visible, and placed at several locations along the runway to ensure that pilots can see them from different approaches.
White runway edge lights indicate the edges of a usable runway, not that the runway is closed. Green centerline lights are utilized to help pilots keep the aircraft centered on the runway during takeoff and landing, especially in conditions of low visibility. Red threshold lights, on the other hand, indicate the start of the usable landing portion of a runway, again not implying that a runway is closed.
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