Finish the following sentence with the best choice: How to find studs in a wall

Choices:
- Move a beer can along a wall, when the can clings to the wall, its found a nail and you have found a stud.
- Move a magnet along a wall, when the magnet clings to the wall, its found a nail and you have found a stud.

Answer:
Move a magnet along a wall, when the magnet clings to the wall, its found a nail and you have found a stud.