单选题There are two classes of vessels which，to the extent necessary to carry out their work，do not have to comply with the rule regarding traffic separation schemes. One of these is a vessel（）.Aengaged in fishing in a traffic laneBservicing a submarine cableCtowing anotherDengaged on pilotage duty
单选题
There are two classes of vessels which，to the extent necessary to carry out their work，do not have to comply with the rule regarding traffic separation schemes. One of these is a vessel（）.
A
engaged in fishing in a traffic lane
B
servicing a submarine cable
C
towing another
D
engaged on pilotage duty
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