Which of the Following Best Defines Cost Leadership

Which of the following best defines cost leadership?

A) It is the positioning strategy of producing a product or service of acceptable quality at consistently lower production costs than competitors can so that a firm can offer the product or service at the lowest price in the industry.
B) It is the positioning strategy of providing a product or service that is sufficiently different from competitors' offerings that customers are willing to pay a premium price for it.
C) It is the positioning strategy to produce a specialized product or service for a limited, specially targeted group of customers in a particular geographic region or market segment.
D) It is the positioning strategy to grow brand performance by reacting to changes in the external environment after they occur instead of following a consistent adaptive strategy.