Which of the following practices should the technician use to make sure the ticket is associated with the correct user?

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?
A . Have the user provide a callback phone number to be added to the ticket
B . Assign the ticket to the department’s power user
C . Register the ticket with a unique user identifier
D . Provide the user with a unique ticket number that can be referenced on subsequent calls.

Answer: D