- Subaccount access
- Google account permissions
- User roles
- User profile filters
The correct answer is: User profile filters
Explanation: To access Campaign Manager, you need a user profile. Any user with admin rights can set up a user profile for you, including publishers and vendors. They also include filters (set by the admin) that determine the kinds of information you can access. Make sure your contact has admin rights and then ask that a user profile with appropriate filters be created in Campaign Manager.
Read more here: https://support.google.com/campaignmanager/answer/2828615