What is true when operating in fog and other vessels are detected by radar? __________

A、 You should make an ample change to port for a vessel crossing on the starboard bow
B、 You should maneuver in ample time if a close-quarters situation is developing
C、 You should determine the course and speed of all radar contacts at six minute intervals
D、 Long-range scanning will provide early warning of all other vessels within the radar's range