The Prisoner's Dilemma

You and an accomplice are arrested for a crime. The police separate you and offer each of you the same deal: If you betray your accomplice and they stay silent, you go free and they get 3 years. If you both betray each other, you both get 2 years. If you both stay silent, you both get only 1 year. Your accomplice is being offered the exact same deal. You cannot communicate with them. What do you do?