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According to Rule 17 — Action by Stand-on Vessel, which statement is correct?
A
"In sight of one another" requires VISUAL observation — radar contact alone does not count.
B
MUST act if collision cannot be avoided by give-way vessel alone.
C
Vessels shall be deemed to be "in sight of one another" only when one can be observed visually from the other.
D
A proper look-out is required at all times, in all visibility conditions.