Since Knot, for engaged couples, and The Nest, for newlyweds so here it represents the example of Concentrated marketing.
Concentrated marketing is the marketing strategy where the firms developed their products for particular segments only in order to target that specific segment or classifications
In the given situation, since an American express introduced two new credit cards designed for very specific markets i.e The Knot, for engaged couples, and The Nest, for newlyweds so this condition specified the concentrated marketing as it focused on one segment only.
Learn more about marketing here: https://brainly.com/question/20070090
