您的同事正在制作其首个面向各大顶级发布商的非 YouTube 联网电视 (CTV) 广告系列，并且希望正确设置该广告系列。 您的同事应该修改哪一项 Display & Video 360 广告系列设置来帮助该广告系列正常投放？

The correct answer is to set the campaign to serve 15, 30, and 60-second ads. This is because CTV environments, especially with top publishers, commonly utilize these standard ad durations. Ensuring your campaign is configured to serve these lengths maximizes the opportunity to participate in auctions and secure inventory, as publishers often specify acceptable ad lengths. Setting the campaign to purchase both programmatic guaranteed and open auction CTV app inventory is not a campaign-level setting; it's managed at the insertion order or line item level. Setting the campaign to only serve on specific devices is too restrictive and would be managed at the line item level through targeting. Adding brand safety targeting to all line items is a good practice but not a fundamental campaign setting required for CTV campaigns to "serve properly" in terms of ad duration compatibility.