A national pet food shop is running a campaign across desktop, mobile phones and tablets. They want to determine which devices their ads have appeared on. Which report should they review?

The "Standard report with platform type dimension" is the correct choice because the Platform Type dimension in Campaign Manager 360 specifically categorizes impressions, clicks, and conversions by the device type (e.g., desktop, mobile, tablet) where the ad was served. This directly answers the question of determining which devices ads appeared on. "Standard report with cross-device conversion dimension" focuses on conversions that occur across different devices, not simply where ads were shown. "Standard report with same-device conversions dimension" tracks conversions on the same device, which is too narrow. "Standard report with environment type dimension" refers to the ad serving environment (e.g., web, in-app), which is different from the device itself.