What does customer relationship management $($CRM$)$ encompass?

A$.$

using information about customers to create marketing strategies that develop and sustain desirable customer relationships

B$.$

a plan that will enable an organization to make the best use of its resources and advantages to meet its objectives.

C$.$

measure of a customer's worth to a business over one's lifetime

D$.$

establishing long$-$term, mutually satisfying buyer$-$seller relationships.