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 or better financing terms to dealers/distributors and providing discount coupons to buyers to help discourage them from experimenting with other suppliers/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