The ______ operation retrieves the item that was added earliest to a queue,but does not remove that item.
A)enqueue
B)dequeue
C)dequeueAll
D)peek

Question

Quizplus · Accepted Answer

The peek operation retrieves the item at the front of the queue (i.e. the item that was added earliest) without removing it. Therefore, it satisfies the requirement stated in the question. The other operations, enqueue and dequeue, involve adding or removing items from the queue, respectively, and dequeueAll would remove all items from the queue.

The ______ Operation Retrieves the Item That Was Added Earliest