To recognize users across different devices, what feature must you enable?

To recognize users across different devices, what feature must you enable?

• Attribution Models
• User ID
• Audience Definitions
• AdWords Linking

Correct answer is:

• User ID

Explanation: The User ID lets you associate engagement data from multiple devices and different sessions with unique IDs.
Read more here: https://support.google.com/analytics/answer/3123662