Cross-domain tracking must be set up first to track users and sessions across multiple domains.
- Google Ads Linking
- Data Import
- Ad Exchange Linking
- Cross-domain tracking
The correct answer is: Cross-domain tracking
Explanation: When you set up cross-domain tracking, you can collect data from multiple websites into a single account property. This lets you see data from different sites in the same reporting view.
Read more here: —https://support.google.com/analytics/answer/1034148
