Question

A banking application uses a Queue to process customer service requests. The following operations are performed: ENQUEUE(Request_

  • A → ENQUEUE(Request_
  • B → ENQUEUE(Request_
  • C → DEQUEUE() → ENQUEUE(Request_
  • D → DEQUEUE() → DEQUEUE() Which request is currently at the FRONT of the queue after all operations?
A Request_A
B Request_B
C Request_C
D Request_D
E The queue is empty
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