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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