Which of the following permutation can be obtained in the same order using a stack assuming that input is the sequence 5, 6, 7, 8, 9 in that order?

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Question:
Which of the following permutation can be obtained in the same order using a stack assuming that input is the sequence 5, 6, 7, 8, 9 in that order?

1.7, 8, 9, 5, 6

2.5, 9, 6, 7, 8

3.7, 8, 9, 6, 5

4.9, 8, 7, 5, 6

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