The owners of Carpo Inc., a watch company, also own a steel company and a leather goods manufacturing company. This relieves them from expenses that they would have to bear, if they had to rely on outside sources for the raw materials needed to make their watches. This enables the company to produce watches at a much lesser cost than other companies in the industry. This scenario best illustrates a ________.A. complementary service
B. emergent strategy
C. unique value
D. cost advantage