If you want to track users and sessions across multiple domains, what must you set up?

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If you want to track users and sessions across multiple domains, what must you set up?
AdWords Linking
Data Import
Ad Exchange Linking
Cross-domain tracking

Correct answer is:

Cross-domain tracking
GA
Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.