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# Best answer: what does it mean?

I've recently answered this question and noticed a weird situation.
The author of the puzzle had in his mind a solution, which happened to be very similar to my answer. Though, he decided to assign the "Best answer" to another solution, simpler and easier to understand, but completely different from the author's solution. Now I ask:
What makes a solution the best?
Apparently, there are only $$3$$ valid answers to my question: