Please choose the correct solution to the question: How do you make sure a shelf is straight before hanging it?

Solution1: Make a mark where you would like to place the fasteners for the shelf. Hold your shelf up in that area and place a level on it.

Solution2: Make a mark where you would like to place the fasteners for the shelf. Hold your shelf upside down in that area and place a level on it.

Answer format: solution1/solution2
Answer: solution1