What Should You Do When You Have a Customer That

 What should you do when you have a customer that is frequently complaining about your company, products, or services?

A) explain how the customer is being inappropriate and end the conversation
B) inform the customer that you agree and will make suggestions to management
C) allow the customer to vent for a while and apologize as necessary
D) if the complaint is not in your area of expertise, explain how it is not your problem and ask to move on