Please choose the correct solution to the question: How to fix a plastic key holder which is broken or split?

Solution1: Heat the plastic with a small flame and once hot, press the two parts together and hold them in place, one you remove them they should hold together again

Solution2: Heat the plastic with a large flame and once melting, press the two parts together and hold them in place, one you remove them they should hold together again

Answer format: solution1/solution2