Final answer:
To set up an escalation queue that enables only upper management to review the tickets, you should use a Priority Queue.
Step-by-step explanation:
To set up an escalation queue that enables only upper management to review the tickets, you should use a Priority Queue. A Priority Queue is a type of queue data structure where each element in the queue has a priority assigned to it. In this scenario, you can assign a higher priority to the tickets that need to be reviewed by upper management. When retrieving tickets from the queue, the highest-priority ticket will be dequeued first, ensuring that only upper management can review them.