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 
TABLE 11-2
-Refer to Table 11-2.Of the choices provided below,what is the minimum value for x in order for both firms' cheating to be a Nash equilibrium?
Definitions:
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