Please choose the correct solution to the question: How do I make sure that the plank is perpendicular to the beam ?

Solution1: Push a side of a mitre square against  the beam and the other side of the miter square against the plank.

Solution2: Push a side of a mitre square against  the beam and the same side of the miter square against the plank.

Answer format: solution1/solution2
Answer: solution1