• User profiles
• Placement strategies
• Content categories
• User roles

The correct answer is: User roles

Explanation: A user role is a set of permissions in Campaign Manager. These permissions determine what kinds of data a user can view or edit. To see your list of user roles, click Admin > User roles. Make sure you know what kinds of access this user role is allowed. If you’re not sure, check the user role first: Find your user role, open it, and check the Permissions tab. When you create a new user role, you have the option to associate it with a particular subaccount. The user role and its permission set will be available for all user profiles you create under that subaccount, but not anywhere else.
Read more here: https://support.google.com/campaignmanager/answer/6098287