Q1 of the Riddle/Puzzle Competition

There are three people A, B, and C, and you meet them. You are given that A always tell the truth and B always lies, and C either always tells the truth or always lies. You don't know who is who. Please determine a strategy to find out if C is a truth-teller or a liar by asking the least amount of questions needed.

Oh and so you need to friend me in order to PM me.

Update on the problem: The three people aren't that smart and they only know which person is a truth-teller and which is a liar.