There Are Different Techniques to Both Initiate and Build Relationships

There are different techniques to both initiate and build relationships with customers by using a combination of online and offline techniques. What is the 'customer life cycle' though?

A) Techniques to encourage customers to increase their involvement with an organisation
B) The stages each customer will go through in a long-term relationship with a supplier
C) An approach to building and sustaining long-term business with a customer
D) The answers above are all correct