An airport maintenance technician performing a nightly check on a precision instrument runway observes that the runway centerline lights change from all white to alternating red and white. What does this color change indicate to a pilot?
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A
The aircraft is in the touchdown zone.
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B
The aircraft has 3,000 feet of runway remaining.
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C
The aircraft is approaching a taxiway intersection.
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D
The runway is closed and should not be used for landing.