Alice, Bob and Charlie are one of each type: a truth-teller (always tells truth), a liar (always lies) and a spy (can lie or tell the truth).
Alice says she is not a truth-teller; Bob says he is not a spy; and Charlie says he is not a liar. What type is Charlie?
A) Truth-teller
B) Liar
C) Spy
D) There is not enough information