- Filter by reporting label
- Filter by feed element name
- Filter by dynamic criteria
- Filter by row ID
The correct answers are: Filter by dynamic criteria and Filter by row ID
Explanation: The preview will be blank until you add filters. You can filter based on the dynamic criteria (or rules) defined in your dynamic profile or you can filter using unique feed row IDs (formerly called “forced preview”).
Read more here:https://support.google.com/richmedia/answer/2871762