（） is a defined area within which ships must use particular caution and should follow the recommended direction of traffic flow.

A.The buoy should be considered to always be in the charted location
B.If the light is flashing，the buoy should be considered to be in the charted location
C.The buoy may not be in the charted position
D.The buoy should be considered to be in the charted position if it has been freshly painted

A.can always rely on a buoy to be on station
B.can always rely on a buoy to show proper light characteristics
C.should assume a wreck buoy is directly over the wreck
D.should never rely on a floating aid to maintain its exact position