A . The South Auxiliary Channel since your draft is less than 25 feet (7.6 meters)，and you are not a passenger vessel
B . The South Auxiliary Channel or Thimble Shoal Channel，but you must remain on the right hand side of the main channel
C . The North Auxiliary Channel since you are going to turn to a northerly heading near buoy "12"
D . You are not permitted to use any of the channels，but must remain outside the buoyed channel line
[问答题] 简述建筑接近限界 approaching clearance。
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