4. Consider the game matrix below. Assume that the payoffs are in years in prison. Hence, exceptionally, lower numbers are better. Clyde Cooperate Defect Cooperate 3,3 10, a Bonnie Defect a, 10 b, b a) For what values of a and b is this game a Prisoners Dilemma? (2 marks) b) List the two features that are required for a game to be a Prisoners Dilemma and briefly explain how your choices in Part (a) satisfy these two requirements. (4 marks)