12. Consider the simultaneous move game between Righty and Lefty shown below, where the first number in each block is the payoff to Lefty and the second is the payoff to Righty. Righty Swerve Straight Swerve 2, 2 x, 4 Lefty Straight 1, y 2, 3 If this particular game has no Nash equilibrium, then possible values of a and y are (a) x = 1 and y = 2. (b) x = 1 and y = 4. (c) x = 3 and y = 2. (d) x = 3 and y = 4