The prisoners' dilemma game a. is a situation in which two players both have dominant strategies which lead to the highest total payoff for the two players. b. has no nash equilibrium since players, after agreeing to play their dominant strategy, will have an incentive to switch to another strategy. c. has a nash equilibrium, but the nash equilibrium outcome is not the outcome the players would agree to if they could cooperate with each other. d. both a and c are correct.