When will Google Analytics be unable to identify sessions from the same user by default?

• When the sessions happen in the same browser on the same device
• When the sessions happen in the same browser on the same day
• When the sessions share the same browser cookie
• When the sessions happen in different browsers on the same device

Correct answer is:

• When the sessions happen in different browsers on the same device

explanation: If the session is happening by the same user, on the same device but in different browser, it will be treated as a session from new user by Google Analytics.