Consider the following payoff matrix. Player 2 A B А. 1,1 0,0 Player 1 B 0,0 2,2 In the evolutionary version of this game: Strategy A is an evolutionarily stable strategy, that is, there is a stable monomorphic equilibrium of all A's. Strategy B is an evolutionarily stable strategy, that is, there is a stable monomorphic equilibrium of all B's. The polymorphic equilibrium where the fraction of A's is • is a/an • equilibrium.