Which of the Following Describes a Customer Loyalty Program

Which of the following describes a Customer Loyalty Program?

A) Firms can create customer communities using company websites and social networks like Facebook to facilitate communication or the exchange of ideas between customers and company personnel.
B) Social media (such as Facebook and Twitter) present a number of opportunities for companies to build, maintain, and strengthen relationships with customers.
C) Rewards repeat customers with discounts or other items depending on the frequency of the purchases.
D) Allows customers to customize goods and services to create a uniqueness to the product.