You're a marketer for a wedding planning business, and you've been running a campaign across mobile web, mobile app, and desktop web platforms. When reviewing the campaign, you see that mobile-related metrics aren't appearing.What may be the cause for the missing metrics?

The correct answer is that mobile reporting dimensions weren't added into Report Builder. Campaign Manager 360 requires specific dimensions to be included in reports to display relevant data. If mobile-specific dimensions (like "Device Type," "Operating System," or "Mobile App Name") are not selected when building a report, mobile-related metrics will not appear, even if the campaign ran successfully on those platforms. The other options are incorrect because they suggest limitations that are not inherent to Campaign Manager 360's campaign setup or reporting. Campaign Manager 360 supports targeting and tracking across mobile web, mobile app, and desktop. A campaign can include both mobile app and mobile website targeting. "Mobile app installs" is a specific conversion type, not a general campaign option that would exclude other mobile metrics.