Powell Lighting was the first company to start selling LED light bulbs in its country—a product that gained popularity among diverse groups. Soon, other companies started to sell their own brands of LED bulbs, thereby giving Powell Lighting ample competition. In response, Powell Lighting decided to limit its LED light bulbs to outdoor models. However, it ensured that these models were the longest-lasting and lowest-priced on the market. With this innovation, Powell Lighting consistently outperformed its competitors for ten years. In this scenario, Powell Lighting maintained a _____ through its innovative strategy.

a. balanced scorecard.

b. fiduciary responsibility.

c. consistent power position.

d. sustainable competitive advantage.