. When two firms interact in an oligopolistic market, which of the following statements is true? (A) If one firm has a dominant strategy, then the other firm does not have a dominant strategy. (B) If one firm has a dominant strategy, then the other firm also has a dominant strategy. (C) Both firms must have dominant strategies. (D) If one firm has a dominant strategy, then there is no Nash equilibrium. (E) If both firms have dominant strategies, then there is a Nash equilibrium