Which one will increase FICO faster-Pay credit card balance in FULL OR leaving some balance behind?
1. Some say that it is will increase FICO score faster if you leave out a balance in your credit card payment
2. Some say that if you pay in full immediately, FICO score won't be affected because you did not show a real history of credit history.
3. Some say that you need to have a balance of 2-3 months before paying in full so that it will affect your credit score.

Which one are true and which one are just myths?
Kindly give links to support the truth regarding credit cards