Walmart employs a method of collecting and storing data about their customers in which data is entered each time a purchase is made by the customer. This enables the company to track how recently purchases have been made, how often they are made, and what amounts of money are being spent. This helps it in maintaining better relation with its customers. Which of the following methods of maintaining a database is employed by Walmart?
A. Delphi technique
B. Cost per order method
C. RFM scoring method
D. Customer development index
E. One step approach
Answer: C