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    Question

    Consider a `Stack` data structure implemented with

    `push` and `pop` operations. What is the final state of the stack after the following sequence of operations?    ```     Stack s;     s.push(10);     s.push(20);     s.pop();     s.push(30);     s.push(40);     s.pop();     ```
    A [10,20,30,40](bottom to top) Correct Answer Incorrect Answer
    B [10,20,30](bottom to top) Correct Answer Incorrect Answer
    C [10,30](bottom to top) Correct Answer Incorrect Answer
    D [10,20,30](bottom to top) Correct Answer Incorrect Answer

    Solution

      Dry Run (Stack: Last In, First Out):            `s.push(10)`: Stack: `[10]`            `s.push(20)`: Stack: `[10, 20]`            `s.pop()`: Removes 20. Stack: `[10]`            `s.push(30)`: Stack: `[10, 30]`            `s.push(40)`: Stack: `[10, 30, 40]`            `s.pop()`: Removes 40. Stack: `[10, 30]`

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