Please choose the correct solution to the question: How to attach clay pots together?

Solution1: Use a nail and nut to pass through the hole at the bottom of the clay pot and use a washer to block the holes completely both inside and outside the pots. Align the two smaller clay pots together and connect with a butterfly nut.

Solution2: Use a screw and nut to pass through the hole at the bottom of the clay pot and use a washer to block the holes completely both inside and outside the pots. Align the two smaller clay pots together and connect with a butterfly nut.

Answer format: solution1/solution2
Answer: solution2