Which Is True of a Nash Equilibrium

Multiple Choice

Which is true of a Nash equilibrium?

A) Both parties must have a dominant strategy for the equilibrium to exist.
B) Neither party must have a dominant strategy but each must know the payoff values.
C) Only one party must have a dominant strategy but the other party must know what that is.
D) Only one party must have a dominant strategy and the other need not know what that is.