Answer:
C. Interact with customers after they have purchased the product
Step-by-step explanation:
The customer service department is the area of the company that handles the relationship with customers after they buy a product which includes answering questions, managing complaints and fixing issues with the product. According to this, the answer is interact with customers after they have purchased the product.
Receive payments from customers and handle the company's money refers to the financial department, promote the company to new groups of potential customers will be the marketing department and handle employee-related procedures will be the human resource department.