When a user calls in to report an issue, a technician submits a ticket on the user's behalf. Which of the following practices should the technician use to make sure the ticket is associated with the correct user?
- Have the user provide a callback phone number to be added to the ticket.
- Assign the ticket to the department's power user.
- Register the ticket with a unique user identifier.
- Provide the user with a unique ticket number that can be referenced on subsequent calls.
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