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  1. Which of the following are correct preprocessor directives in C?

    1: #ifdef
    2: #if
    3: #elif
    4: #undef

    2. A.
    1, 2
    B.
    4
    C.
    1, 2, 4
    D.
    1, 2, 3, 4

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    Answer : Option D

    Explanation :

    The macros #ifdef #if #elif are called conditional macros.

    The macro #undef undefine the previosly declared macro symbol.

    Hence all the given statements are macro preprocessor directives.

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