Please choose the correct solution to the question: To reinforce a paper project,

Solution1: cut a piece of cardboard in equal size to the paper you want to strengthen, and glue the cardboard to the back of the paper design.

Solution2: cut a piece of cardboard in equal size to the paper you want to strengthen, and glue the cardboard to the front of the paper design.

Answer format: solution1/solution2
Answer: solution1