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 X 400 100 500 300 Strategy Y 200 80 210 350