When responding to a customer request or complaint, how can a writer achieve the best results possible?

Question $5$ options:

A$)$

By offering future discounts and benefits to ensure loyalty

B$)$

By showing understanding for the customer request or complaint

C$)$

By indicating how company policy determines the response to the request or complaint

D$)$

By indicating a more appropriate method of filing the request or complaint

E$)$

By identifying who is at fault regarding the request or complaint, and then offering a solution anyway