Answer:
Account Management
Explanation:
According to my research on different business roles and responsibilities, I can say that based on the information provided within the question the department being defined is called Account Management. like mentioned in the question this department focuses on managing sales and relationships with individual customers or clients of the business that they work for. This is done in order to maintain or grow their company-client relationships.
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.