________ is the performance of any helpful or professional work or activity for a person, family, or organization.

A) Customer satisfaction
B) Value creation
C) Customer service
D) Market follow-up
E) Service customization

Customer service refers to the assistance and advice provided by a company to those people who buy or use its products or services. This encompasses a wide range of activities designed to support customers in making cost-effective and correct use of a product, including assistance in planning, installation, training, troubleshooting, maintenance, upgrading, and disposal of a product.