When setting up targeting groups for video ads, it’s most effective to:
- A) select a maximum of 3 targeting groups
- B) select at least 5 advanced audience options
- C) target broadly by demographic groups, topics, or interests
- D) target narrowly by demographic groups, topics, or interests
These targeting methods are added at the ad group level. It’s important to know that with each targeting method you add you narrow, not widen, your targeting.
Read more here: https://support.google.com/partners/answer/2454017