What is the best way to: To personalise keys.

Pick from:
[A]. Want to tell your keys apart from one another? Paint the sharp ends of the keys with the nail polish of your choosing, and leave to set. If need be,turn the key over and paint the other side.
[B]. Want to tell your keys apart from one another? Paint the blunt ends of the keys with the nail polish of your choosing, and leave to set. If need be,turn the key over and paint the other side.
Answer:
[B].