Question: (4) Suppose that a client performs an intermixed sequence of (stack) push and pop operations. The push operations put the integers 0 through 9 in

(4) Suppose that a client performs an intermixed sequence of (stack) 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 sequence(s) could not occur?

a. 1 2 3 4 5 6 9 8 7 0 b. 0 4 6 5 3 8 1 7 2 9 c. 1 4 7 9 8 6 5 3 0 2 d. 2 1 4 3 6 5 8 7 9 0 e. 4 3 2 1 0 9 8 7 6 5 f. 4 6 8 7 5 3 2 9 0 1 g. 2 5 6 7 4 8 9 3 1 0 h. 4 3 2 1 0 5 6 7 8 9 

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