A vessel transferring provisions or cargo at sea shall display during the day（）.<br>A:two black balls in a vertical line<br>B:three black balls in a vertical line<br>C:three shapes in a vertical line； the highest and lowest shall be red balls and the middle a white diamond<br>D:three black shapes in a vertical line； the highest and lowest shall be balls and the middle one a diamond

A vessel transferring provisions or cargo at sea shall display during the day（）.
A:two black balls in a vertical line
B:three black balls in a vertical line
C:three shapes in a vertical line； the highest and lowest shall be red balls and the middle a white diamond
D:three black shapes in a vertical line； the highest and lowest shall be balls and the middle one a diamond

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