7. Consider the normal-form game pictured here: 2 X Y Z A 2.0 1, 3 5, x B 5. 4 1. 3 6, 2 All of the payoff numbers are specified, with the exception of that denoted by x. Find a number for x such that the following three statements are all true: (B, X) is a Nash equilibrium, (A, Z) is an efficient strategy profile, and, for the belief 01 = (, 2), Y is a best response for player 2; that is, Y E BR2(01)