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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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