Suppose that firm A finds itself facing the following payoff matrix in its rivalry with firm B: B's Strategies A's Strategies Y Z W (A gets -2, B gets 2) (A gets 1, B gets 1) X (A gets 0, B gets 0) (A gets 3, B gets -6) O a. credible because the Nash equilibrium occurs where A plays W and B plays Z. O b. credible because the joint optimal solution occurs where A plays W and B plays Z. O c. not credible because A's dominant strategy is to play X. O d. redible because A's dominant strategy is to play W. O e. not credible because B will always play strategy Z