For the following payoff matrix, find these: a) Nash equilibrium or Nash equilibria (if any) b) Secure strategy equilibrium (Note: the "secure strategy" equilibrium is the same as the "maximin strategy" equilibrium) c) Collusive equilibrium (also known as the "cooperative equilibrium") d) Dominant strategy of each firm (if any) Firm A Strategy X Strategy Y Firm B Strategy 1 400, 100 200, 80 Strategy 2 500, 300 210, 350