What indicates a dual purpose buoy? （）<br>A:Red buoy with a horizontal yellow band<br>B:Red and white vertically-striped buoy with a vertical yellow stripe<br>C:Red and white vertically-striped buoy with a red spherical topmark<br>D:Green buoy with a yellow square

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

出自：海船船员证

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