Navigation lights must be displayed in all weathers from sunset to sunrise. They also（）.<br>A:must be displayed when day signals are being used<br>B:must be displayed when moored to a pier<br>C:may be extinguished at night on open waters when no other vessels are in the area<br>D:may be displayed during daylight

Navigation lights must be displayed in all weathers from sunset to sunrise. They also（）.
A:must be displayed when day signals are being used
B:must be displayed when moored to a pier
C:may be extinguished at night on open waters when no other vessels are in the area
D:may be displayed during daylight

出自：海船船员证

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