While driving on an airside vehicle roadway, you approach a sign with a red background and white text that reads 'RWY 33'. What does this sign indicate?
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A
A destination sign for Gate 33.
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B
A mandatory instruction sign for an upcoming runway holding position.
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C
An information sign indicating the distance to Runway 33 is 3,300 feet.
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D
A location sign indicating you are currently on Taxiway 33.