Use the following setting for questions 4-9. Consider the following static Prisoner's Dilemma game. For the following parts, suppose this game is played for innitely many times with discount factor for both players 5 6 [0,1). 9. For this question consider the following extended Prisoner's Dilemma with additional pun- ishment strategy (P). Let both players adopt the following strategy: start with cooperation; cooperate if both play- ers cooperated or both players played punishments strategy in the previous period; punish if (1) one player defected and the other player cooperated in the previous period or {2) if one player played punishment and the other one did not. In other words, the punishment for deviating from cooperation or punishment only lasts for one period, and both players revert to cooperation immediately after. What is the condition on 5 for this strategy prole to be a SPNE? (a) 621/3 (b) 621/2 (0) 622/3 (d) 523/4 (e) 624/5