The payoff matrix below shows the payoffs for Firm A and Firm B, each of whom can either \"cooperate\" or \"cheat.\" The numbers in parentheses are (payoff for A, payoff for B).
Firm B
Firm A
Cooperate
Cheat
Cooperate
(45,45)
(x,15)
Cheat
(15, x)
(30,30)
What is the minimum value for x in order for both firms' cheating to be the only Nash equilibrium?
? A. 47
B. 52
C. 57
D. 35
? E. 62