Which is a method for evaluating performance of engagement ads created with the Ad gallery?
Funnel visualization report
AdSense reports in Google Analytics
Transaction rate
Mouseover rate
Explanations:
See instances where customers place their cursors over your display ad for a second or more. This can help highlight ads that may keep customers’ attention without an actual clickthrough to your website. This usually demonstrates an ad that needs a stronger call-to-action for the customer.
Read more here: https://support.google.com/adwords/answer/2456138?hl=en
Source