A Nash Equilibrium Is

A Nash equilibrium is:

A) When there is no unilateral profitable deviation for any player.
B) The strategy adopted by every player is optimal given the strategies adopted by every other player.
C) When all player's adopt their best response to the strategies of all other players in the game.
D) Players adopt strategies so that the total payoff to all players is maximized.
E) a, b, and C