Suppose that a client performs an intermixed sequence of enqueue and dequeue operations on a FIFO queue. The enqueue operations insert the integers 0 through 9 in order onto the queue; the dequeue operations print the return values. Which of the following sequence(s) could not occur?
a. 0 1 2 3 4 5 6 7 8 9
b. 4 6 8 7 5 3 2 9 0 1
c. 2 5 6 7 4 8 9 3 1 0
d. 4 3 2 1 0 5 6 7 8 9
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