Turner Electronics is a ten-year-old company. In the past decade, the company hasn't created any innovative products that have helped set it apart from the rest of its competitors. However, when any of its products need to be repaired or fine-tuned, it offers its customers top-notch product checks. As a result, the company has managed to retain its wide customer base. Which of the following strategies is Turner Electronics using in this scenario?
a. Product development
b. Diversification
c. Market penetration
d. Service differentiation
Answer: d. Service differentiation