Users under the same SAS account cannot be restricted to specific advertisers.

This statement is False. Amazon Ad Server (SAS) allows for granular control over user permissions. Account administrators can restrict users to specific advertisers, campaigns, or even specific ad placements. This is a fundamental security and operational feature, ensuring that users only have access to the data and functionalities relevant to their roles. For example, an agency managing multiple clients can assign different team members access only to their respective client accounts, preventing unauthorized access or accidental modifications to other advertisers' campaigns. The "True" option is incorrect because it contradicts this core functionality of user management within SAS.