One-way? Really?

Classical Mechanics Level 2

The picture shows a metal plate in the shape of a square with a circular hole cut in its middle. This plate is heated. What do you think will happen to the size (area) of the hole?

Decreases because the metal plate expands in all directions Increases because the metal wants to feel spiritually connected to the universe (holy; hole-y ;)). Increases Remains the same because only metals expand while holes do not. Decreases because the metal plate due to increase in vibrations of metal atoms in all directions.