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

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

• ক. If box 2 contains only small and medium-sized hats, box 1 does not contain small hats.
• খ. If box 2 contains at least medium-sized and large hats, box 4 does not contain large hats.
• গ. If box 3 contains at least small and large hats, box 2 does not contain large hats.
• ঘ. If box 1 contains at least small and medium-sized hats.