Which of the Following Is True of Proactive Customer Service

Which of the following is true of proactive customer service?

A) It requires companies to wait for customers to complain before responding.
B) Companies adopting this approach to customer service view unhappy customers as unprofitable.
C) Use of social media to track customer complaints reduces a firm's efforts toward proactive customer service.
D) It can be achieved by monitoring customer activity on the web and using big data analytics.
E) Companies using proactive customer service wait for a significant number of customers to call in complaints so they can analyze if a problem requires attention.