Which of the Following Is an Incorrect Statement About a Nash

Which of the following is an incorrect statement about a Nash equilibrium?

A) In a Nash equilibrium, all players are better off than they would be with any other combination of strategies.
B) A Nash equilibrium is an example of a non- cooperative equilibrium.
C) In a Nash equilibrium, all players are maximizing their payoffs given the current behaviour of the other players.
D) Once a Nash equilibrium is established, no individual firm has an incentive to depart from it.
E) A Nash equilibrium is a self- policing equilibrium.