Your company is opening a new restaurant next month and creating several 30-second videos to promote the grand opening. They want to determine which of the ads viewers watched to the end most often so they can prioritize showing that ad. Within Display & Video 360, what video creative optimization type should you use to achieve that goal?

Optimizing for completions directly addresses the goal of identifying which ads viewers watched to the end most often. This optimization type will prioritize serving video creatives that are most likely to be viewed in their entirety, thus helping to determine the most engaging ad. Optimizing for time spent on-screen is related but less precise for "watched to the end" as it could include partial views. Optimizing for conversions or clicks would prioritize different metrics (website visits, purchases, etc.) and not necessarily video completion rates.