Your sunglasses retail chain client would like to start running mobile ads in their current campaign.Some creatives are already optimized for mobile and may already appear across mobile websites.What's the first thing to check within their Campaign Manager 360 account to verify that these ads serve?

To ensure that mobile ads for the sunglasses retail chain client start serving in their current campaign within Campaign Manager360,the correct first step is to"look at their campaign settings in Campaign Manager 360 to see if their ads are optimized for mobile."This involves reviewing the campaign settings to verify whether the ads are configured and setup to be compatible and optimized for mobile devices.Checking this setting ensures that the creatives which are already optimized for mobile will display correctly across mobile websites and apps,maximizing the campaign's reach and effectiveness on mobile platforms.It also ensures that any necessary adjustments can be made to align the campaign settings with the client's objective of running mobile ads,there by optimizing ad delivery and performance.Therefore,this option correctly identifies the initial action to take within Campaign Manager 360 to ensure that the sunglasses retail chain client's mobile ads are setup and ready to serve effectively across mobile devices.