Final answer:
Account services in an advertisement agency are responsible for maintaining the relationship between the agency and its clients, coordinating with departments like marketing and public relations, and aiding in the creation of advertising strategies.
Step-by-step explanation:
The true statement about account services in an advertisement agency is that it is the link between the advertisement agency and its clients. Account services are not solely focused on providing media space and time, nor are they an in-house service independent of clients' obligations. Instead, account services teams work closely with clients to understand their needs and objectives to develop and coordinate advertising campaigns. They collaborate with various departments within the agency such as the creative team, the marketing office, and the public relation office to craft messages and strategies that align with the client's goals. These services are crucial for ensuring effective communication and creating successful advertising campaigns.