All of the following are signals to would-be challengers that retaliation is likely excepta) creating collaborative relationships with other industry leaders to block new entrants. b) publicly announcing management's commitment to maintaining the firm's present market share. c) making an occasional strong counter-response to the moves of weak competitors to enhance the firm's image as a tough defender. d) publicly committing the company to a policy of matching competitor's terms or prices. e) maintaining a war chest of cash and marketable securities