The risks of a focus strategy include: a. decisions by focused competitors to use their resources to serve a wider range of customers' needs. b. a competitor's ability to use its core competencies to outfocus the focuser by serving an even more narrowly defined segment. c. decisions by industry-wide competitors to use their resources to serve a wider range of customers' needs than the focuser has been serving. d. a competitor's ability to use its core competencies to outfocus the focuser by serving an even more broadly defined segment.