If an error in your work is discovered by a customer, the best way to assist in promoting good relations is to:

A$.$ Admit the error and, if possible, correct is$.$

B$.$ Be more careful in the future because such errors hurt the agency.

C$.$ Apologize and assure the customer that you will make no more errors.

D$.$ Explain to the customer the precautions which are taken to prevent such errors.

E$.$ Minimise the mistake. The customer will feel uncertain about the Agency's practices if mistakes are made.