你的客戶即將在下個月推出一部紀錄片。他們準備了三部不同的 30 秒宣傳影片，並想知道哪部廣告最常吸引觀眾全部看完。 如要優先放送該廣告，可以在 Display & Video 360，對影片廣告素材採用哪種最佳化方式？

The client wants to identify which ad is most frequently watched to completion. The "Increase complete views" optimization goal in Display & Video 360 directly aligns with this objective. It prioritizes serving the ad creatives that are most likely to be viewed in their entirety, helping the client determine the most engaging promotional video. "Increase conversions" would optimize for actions like website visits or purchases, not video completion. "Increase dwell time" focuses on how long users interact with an ad, which is related but not precisely the goal of full completion. "Increase clicks" optimizes for users clicking on the ad, which is a different engagement metric than watching the entire video.