If a sailboat has the wind on her starboard side, what is her classification?

A sailboat with the wind on her starboard side is considered to be on a "starboard tack." Under the navigation rules, a vessel on a starboard tack is the stand-on vessel when encountering one on a port tack. This means that the sailboat has the right of way over a vessel on a port tack, which is required to give way. Thus, classifying the sailboat as a stand-on vessel is appropriate because it has priority over a vessel that must yield under these circumstances.

It’s also important to recognize that this answer does not pertain to the classifications of power-driven or outboard vessels, which are not relevant to the question regarding the wind's position relative to the sailboat. Stand-on and give-way vessel classifications stem specifically from sailing maneuvers and interactions with other vessels.