At night, I see this light at the top of the mast. I conclude that it’s a sailboat under 12 m?

When night falls, a sailboat lights up a tricolor light at the masthead. I see its red and white. Does this single light tell me that it’s a sailboat under 12 m? Answer A. It has nothing to do with size, because all sailboats can carry a single tricolor light at the masthead? Answer B. Only sailboats under 20 m can carry a single tricolor light at the masthead. Answer C.

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