- Constant matching
- Filter by feed row ID
- Feed scheduling
- Profile field
The correct answer is: Profile field
Explanation: Use profile fields to manually update the content of a dynamic element without editing your creative’s code. For example, you may want to be able to update a headline after your campaign is already live. If you set up a profile field for this headline, you can update it whenever you want without having to upload new creatives and traffic them.
Read more here:https://support.google.com/richmedia/answer/6010531