Which of the Following Is an Incorrect Statement About a Nash

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

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