单选题A red triangular daymark marks（）.Athe centerline of a navigable channelBthe starboard side of a channelCa prominent object of navigational interest that has no lateral significanceDarea of a channel where passing another vessel is permitted
单选题
A red triangular daymark marks（）.
A
the centerline of a navigable channel
B
the starboard side of a channel
C
a prominent object of navigational interest that has no lateral significance
D
area of a channel where passing another vessel is permitted
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