To identify and prioritize the ad that viewers watch to the end most often for promoting a new novel with four unique 30-second videos, you would use the “Optimize for completions” type of video creative optimization in Display & Video 360.
- Optimize for clicks
- Optimize for time spent on-screen
- Optimize for conversions
- Optimize for completions
The correct answer is: Optimize for completions
Explanation: The “Optimize for completions” feature ensures that video creatives with the highest likelihood of being watched in full, with both audibility and viewability upon completion, are prioritized in the ad auction or guaranteed deals. This approach is driven by collecting playback data to deliver ads expected to meet these criteria more frequently. Known as Audibility and Viewability On Completion (AVOC), it allows advertisers to efficiently use their video creatives by focusing on those that engage audiences effectively, thus enhancing the overall campaign performance.
Read more here: https://support.google.com/displayvideo/answer/7558640