单选题What indicates a dual purpose buoy? ()ARed buoy with a horizontal yellow bandBRed and white vertically-striped buoy with a vertical yellow stripeCRed and white vertically-striped buoy with a red spherical topmarkDGreen buoy with a yellow square

单选题
What indicates a dual purpose buoy? ()
A

Red buoy with a horizontal yellow band

B

Red and white vertically-striped buoy with a vertical yellow stripe

C

Red and white vertically-striped buoy with a red spherical topmark

D

Green buoy with a yellow square


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