What will be the output of the following C code?#include

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What will be the output of the following C code?

#include <stdio.h>
    int fun();
    int main()
    {
        int n = fun();
    }
    fun()
    {
        printf("100");
        return 100;
    }

1. Compilation Error
2. 100
3. Depends on compiler
4. Runtime Error
5. None of these

100