Which of the following scenarios illustrates a firm that has a sustainable competitive advantage? a. jamison inc. generated revenue of $300,000 this financial year, which is close to the industrial revenue average of $320,000.b. cr inc. almost doubled its sales to 9,000 units this year compared to its previous year's sales of 5,000 units, though the industry average is 10,000 units. c. zhang corp. was able to hold its market share of 68 percent in the social networking industry for more than three years. d. peak inc. was able to outperform its competitors with its new production system, in terms of revenue, for a brief period of four months.