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  1. Preprocessor directive #undef can be used only on a macro that has been #define earlier

    2. A.
    True
    B.
    False

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    Answer : Option A

    Explanation :

    True, #undef can be used only on a macro that has been #define earlier

    Example: #define PI 3.14

    We can undefine PI macro by #undef PI

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