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What is the entry returned by the peek method after the following stack operations. push(A), peek(),...

What is the entry returned by the peek method after the following stack operations.
push(A), peek(), pop(), push(R), peek(), push(P), pop(), peek(), push(D), pop(), peek(), push(D), pop(), push(J), peek(), push(O), pop(), peek(), pop()

1. A
2. D
3. R
4. None of above

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the entry returned by the peek method after the following stack operations is R

3. R

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