Which choice is an include guard for the header file my_library.h?

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  • A
    #ifdef MY_LIBRARY_H
    #define MY_LIBRARY_H
    // my_library.h content
    #endif /* MY_LIBRARY_H */
  • B
    #ifndef MY_LIBRARY_H
    #define MY_LIBRARY_H
    // my_library.h content
    #endif /* MY_LIBRARY_H */
  • C
    #ifdef MY_LIBRARY_H
    #undef MY_LIBRARY_H
    // my_library.h content
    #endif /* MY_LIBRARY_H */
  • D
    #define MY_LIBRARY_H
    #include MY_LIBRARY_H
    // my_library.h content
    #undef MY_LIBRARY_H
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