Please choose the correct solution to the question: How do you put insulation in a wall?

Solution1: Be sure the gaps between the board match the width of the insulation, use a pencil to cut the insulation to the correct vertical length, then press in by hand.

Solution2: Be sure the gaps between the board match the width of the insulation, use a blade to cut the insulation to the correct vertical length, then press in by hand.

Answer format: solution1/solution2
Answer: solution2