Answer: c. customer relationship management.
Step-by-step explanation:
Customers are the most important part of the business because they are the ones that patronize it. This is why some businesses try their best to establish a relationship with customers such that the customers keep coming back as well as recommending their business to potential customers as well.
Strategies that are related to ensuring the above fall under Customer Relationship Management. One such strategy is described in the scenario above and that is the maintenance of customer contact details in order to send them messages related to promotions and coupons so that they may keep patronizing the company.