Which ad rotation option can’t be used for video campaigns?
- Rotate evenly
- Optimize for clicks
- Optimize for conversions
- Optimize for views
You can use the ad delivery setting to specify how often we deliver your active ads in relation to one another within an ad group. For example, you can optimize your ads for views, conversions, or rotate them evenly. With the ad delivery setting, you can also set a frequency cap.
“Optimize for clicks is not available in video campaigns.”
Read more here: https://support.google.com/partners/answer/112876?hl=en