Please choose the correct solution to the question: To make a piping tip from a soda bottle,

Solution1: screw on the cap, cut a star shape into the cap with an X-acto knife, and then slice off the top of the bottle 1" from the end with the knife.

Solution2: screw on the cap, cut a star shape into the cap with a serrated knife, and then slice off the top of the bottle 1" from the end with the knife.

Answer format: solution1/solution2
Answer: solution1