Which of the following is not a potential defensive move to ward off challenger firms?

Making an occasional strong counter$-$response to the moves of weak competitors to enhance the firm's image as a tough defender

Granting volume discounts or better financing terms to dealers$/$distributors to discourage them from experimenting with other suppliers$/$brands and$/$or trying to convince them to handle its product exclusively and force competitors to use other distribution outlets

Maintaining a war chest of cash and marketable securities

Using a blue ocean strategy to maneuver around competitors and concentrate on capturing unoccupied or less contested market territory

Lengthening warranties, offering free or low$-$cost training and support services, and providing coupons and sample giveaways to buyers most prone to experiment with using rival brands