Finish the following sentence with the best choice: How to flatten a bottle cap easily?

Choices:
- Use a pliers to bend the edges inward and place underneath a piece of carboard, bang down on the cap with a rubber mallet
- Use a pliers to bend the edges outward and place atop a piece of cardboard, bang down on the cap with a rubber mallet

Answer:
Use a pliers to bend the edges outward and place atop a piece of cardboard, bang down on the cap with a rubber mallet