Finish the following sentence with the best choice: How can you identify often used key's quickly?

Choices:
- Paint the key with fingernail polish to color code -or even label with the name if you choose.
- Paint the door lock with fingernail polish to color code -or even label with the name if you choose.

Answer:
Paint the key with fingernail polish to color code -or even label with the name if you choose.