You see a vessel displaying three lights in a vertical line.The highest and lowest lights are red and the middle light is white.She is also showing a white light at the stern，which is lower than the forward light.It could be a（）.<br>A:Survey vessel<br>B:Vessel not under command<br>C:Vessel aground<br>D:Pilot vessel with port side to you

You see a vessel displaying three lights in a vertical line.The highest and lowest lights are red and the middle light is white.She is also showing a white light at the stern，which is lower than the forward light.It could be a（）.
A:Survey vessel
B:Vessel not under command
C:Vessel aground
D:Pilot vessel with port side to you

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