单选题Which of the following are data layer categories to be displayed on ECDIS（）．AECDIS warnings and messagesBHydrographic Office dataCNotice to Mariners informationDAll of the above
单选题
Which of the following are data layer categories to be displayed on ECDIS（）．
A
ECDIS warnings and messages
B
Hydrographic Office data
C
Notice to Mariners information
D
All of the above
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解析：
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