You’ve been running a campaign for your bottled water company across mobile phones, tablets, and desktops. You’d like to figure out which devices your ads have appeared.Which report should you check on?

The standard report with the "Platform Type" dimension is the correct choice because it directly categorizes impressions, clicks, and conversions by the device type where the ad was served (e.g., mobile, tablet, desktop). This allows you to see exactly which devices your ads appeared on. "Environment type" refers to the context where the ad appeared, such as "web" or "app," but doesn't specify the device itself. "Same-device conversions" and "cross-device conversions" are metrics related to conversion paths and user behavior across devices, not the device where the ad was initially displayed. While these are important for understanding user journeys, they don't answer the question of where the ads appeared.