Section II - Queues 16. Suppose that a queue contains the following values Front { 5, 2, 9, 7} Rear. Problems 16-19 Questions on Queue ADT concepts What is the contents of the queue after the following operation? Enqueue(1) A) Front f 5, 2, 9, 7, 1} Rear B) Front {1, 5, 2, 9,7} Rear C) Front { 5, 2, 9, 7} Rear D) Front {2, 9, 7} Rear E) None of the answers provided 17. Suppose that a queue contains the following values Frontf 5, 2, 9,7 } Rear. What is the contents of the queue after the following operation? Dequeue() A) Front { 5, 2, 9, 7} Reair B) Front f5, 2, 9} Rear C) Front { } Rear D) Front { 2, 9, 7 } Rear E) None of the answers provided 18. Suppose that a queue contains the following values Front { 5, 2,9,7 \ Rear. What is the contents of the queue after the following sequence of operations are executed left-to-right? Enqueue(1), Dequeue() A) Front { 5, 2, 9,7} Rear B) Front 1 5, 2, 9,7, 1} Rear C) Front {1, 5, 2, 9,7} Rear D) Front f2, 9,7} Rear E) None of the answers provided 19. Suppose that a queue contains the following values Front 5, 2, 9,7 } Rear. What is the contents of the queue after the following sequence of operations are executed left-to-right? Dequeue), Enqueue(5) D) Front 5, 2, 9.71 Rear A) Front f 5, 2, 9, 5} Rear B) Front { 5, 2, 9,7, 5} Rear C) Front { 5, 5, 2, 9,7} Rear E) None of the answers provided