Amazon at first defined itself in product terms$$as online bookstore competing against physical bookstores by offering a huge selection of books, conveniently available and at market$-$beating prices. Before long, however, Amazon adopted a broader view. It defined itself as "the Earth's most customer$-$centric company," where customers could find and discover anything they might want to buy online. This is an example of $\_\_\_\_\_\_\_\_.$

Group of answer choices

the market concept of competition

the competitor concept

a market follower strategy

product adaptation

a niche strategy