Please explain why each statement is either right or wrong, thanks! :-)

Consider a queue on which we will execute an intermixed sequence of enqueue and dequeue operations. The enqueue operations put the integers 0 through 9 in order onto the queue: the dequeue operations print out the return value. Which of the following sequence should not occur? 4 6 8 7 5 3 2 9 0 1 All of the above 4 3 2 1 0 5 6 7 8 9 2 5 6 7 4 8 9 3 1 0