What ad setting ensures a qualified user will always be served a city-targeted ad first over a country-targeted ad when both ads are assigned to the same placement?
- Frequency cap
- Keyword targeting
- Dynamic targeting keys
Priority: This determines which ad serves when a user is eligible for multiple ads on the same placement. Priority is set by default based on ad type and scheduling. The lower the priority number, the greater the priority with which it is served.
Read more here: https://support.google.com/dcm/answer/2826012