Answer: Customer excellence
Explanation: Customer excellence refers to the competitive advantage gained by a firm by being the best in the eyes of their customer. A firm having customer excellence might not be the number one in the market but it does possess high potential growth.
In the given case, the bank states them as the best service provider in the industry. If the customers agree to such statement then we can conclude that the customers considers the bank best.
Hence the bank creates and delivers value through customer excellence.