Which of the Following Is Necessary for a Nash Equilibrium

Multiple Choice

Which of the following is necessary for a Nash equilibrium in a two-player game where both players have three strategies each?

A) The players should behave altruistically.
B) At least one of the two players should have a dominant strategy.
C) The game should be simultaneous and not sequential.
D) It is not necessary for either player to have a dominant strategy.