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    Question

    Which of the following is a common way to achieve

    abstraction in OOP?
    A By making all methods concrete. Correct Answer Incorrect Answer
    B By using only concrete classes. Correct Answer Incorrect Answer
    C By defining abstract classes and interfaces. Correct Answer Incorrect Answer
    D By exposing all internal variables as public. Correct Answer Incorrect Answer
    E By using global functions. Correct Answer Incorrect Answer

    Solution

    By defining abstract classes and interfaces.

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