Final answer:
The situation described as a customer complaining about his old computer tower is a customer service complaint. Such a complaint would typically be addressed by a tech support or customer service department within a business, focusing on resolving technical issues and improving customer satisfaction.
Step-by-step explanation:
D) Customer service complaint
The question appears to be describing a situation where a customer is expressing dissatisfaction with his old computer tower. This falls under the category of a customer service complaint. In any business, especially in the technology sector, addressing customer complaints promptly and effectively is crucial for maintaining a positive relationship with the customer base and ensuring their loyalty. A complaint such as a computer malfunction can often be complex, involving hardware or software issues, and thus requires technical support to diagnose and resolve.
It could also involve customer feedback if the client provides suggestions on how their experience could have been improved or comments on the quality of the computer tower. The correct handling of such complaints is integral to the operations of a tech-based customer service department.