You can have multiple answer windows open, and you can then delete or add an answer even after "Best Answer" is chosen as long as that window is open. It is also how someone can remove an answer in case their answer is not chosen as "Best Answer" or then change an answer or add to or add an additional answer after the fact. As long as that 2nd or 3rd or however many multiple windows are open, anyone can do this. Cheers and stay safe!

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