A focused low-cost strategy ________.a. involves serving buyers in the target market niche at a lower cost and a lower price than rival competitors. b. is the hardest of the four generic types of competitive strategies to employ successfully. c. involves the use of deep price discounting to capture customers. d. entails trying to wrest market share away from rivals via extra advertising, above-average expenditures for promotional programs, and heavy use of point-of-sale merchandising techniques. e. cannot be sustained over time unless the focuser is aggressive in entering other segments where it also can achieve a low-cost advantage.