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

Choices:
- press the ends of the cap inward and then use a wooden mallet and hammer down on the cap until it is flat
- press the ends of the cap outward and then use a rubber mallet and hammer down on the cap until it is flat

Answer:
press the ends of the cap outward and then use a rubber mallet and hammer down on the cap until it is flat