Which of the Following Is a Potential Defensive Move to Ward

Which of the following is a potential defensive move to ward off challenger firms?

A) granting volume discounts,offering better financing terms to dealers/distributors,and providing discount coupons to buyers to help discourage them from experimenting with other suppliers or brands
B) signaling challengers that retaliation is likely in the event they launch an attack
C) making an occasional strong counter-response to the moves of weak competitors to enhance the firm's image as a tough defender
D) maintaining a war chest of cash and marketable securities
E) All of these choices are correct.