For a connected TV (CTV) campaign within Display & Video 360, what report shows the total number of engaged users?

The Reach Overlap report is the correct choice because it provides insights into unique reach and frequency across different dimensions, including devices and inventory sources, which is crucial for understanding engaged users in a CTV campaign. It helps identify how many unique users were reached and how often, and if there's overlap between different parts of your campaign. The Audience Composition report shows demographic and interest-based breakdowns of your audience, not total engaged users. The Floodlight report tracks conversions and custom events, not unique user engagement. The Inventory Availability report shows available impressions for targeting, not user engagement metrics.