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If at least small and medium-sized hats are known to be in box 4, which of the following must be true?

1. A If box 1 contains at least small and medium-sized hats.
2. B If box 2 contains at least medium-sized and large hats, box 4 does not contain large hats.
3. C If box 2 contains only small and medium-sized hats, box 1 does not contain small hats.
4. D If box 3 contains at least small and large hats, box 2 does not contain large hats.