A mobile offshore drilling unit under tow is approaching a fog bank. When should fog signals be started? （）<br>A:When the towing vessel enters the fog<br>B:When the drilling rig enters the fog<br>C:When the towing vessel can no longer be seen from the rig<br>D:Immediately

A mobile offshore drilling unit under tow is approaching a fog bank. When should fog signals be started? （）
A:When the towing vessel enters the fog
B:When the drilling rig enters the fog
C:When the towing vessel can no longer be seen from the rig
D:Immediately

出自：海船船员证

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