Question: Suppose that a program performs an intermixed sequence of push and pop operations. The push operations put the integers 0 through 9 in order onto

Suppose that a program performs an intermixed sequence of push and pop operations. The push operations put the integers 0 through 9 in order onto the stack; the pop operations print out the return values. Which of the following sequences of pops could not occur?

a) (first pop) 4 3 2 1 0 9 8 7 6 5 (last pop)

b) (first pop) 4 6 8 7 5 3 2 9 0 1 (last pop)

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