Please choose the correct solution to the question: To prevent cake from sticking to the cake pan.

Solution1: Grease the inside of the pan with shortening and then flour it. I also place a round piece of parchment paper on the bottom.

Solution2: Grease the inside of the pan with shortening and then sugar it. I also place a round piece of parchment paper on the bottom.

Answer format: solution1/solution2