In a repeated prisoner’s dilemma, a player that is playing tit-for-tat will:
defect in the first round and defect in all subsequent rounds
defect in the first round, and in any subsequent round, do what their opponent did last round
cooperate in the first round and defect in all subsequent rounds
cooperate in the first round and cooperate in all subsequent rounds
cooperate in the first round and, in any subsequent round, do what their opponent did last round