Based on Góogle Analytics Certification, the analytics feature allows you to connect individual customers' behavior across different interactions on different platforms and devices is User-ID
User ID is a term that is used to describe a User Identifier, usually a specific value and easily known by the operating systems to identify a user.
User identifier or User ID is known along with the group identifier and other access control criteria and is utilized to specify which system resources a user can access.
With góogle analytics certification, the User-ID allows system analysts to connect individual customers' behavior across different interactions on different platforms and devices,
Hence, in this case, it is concluded that the correct answer is the User-ID
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