【单选题】
A A.Illuminate red when the related landing gear is not down and locked and the gear handle is down.
B B.Illuminate red when the related landing gear is not down and either thrust lever is retarded to idle at a radio altitude of 800 feet or less.
C C.Illuminate green when the landing gear is in agreement with the landing gear lever.
D D.Are a redundant but separate set of landing gear indicator circuits and green lights.
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