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 main()
    {
        char buff[25];
        stderr = stdin;
        fscanf(stderr, "%s", buff);
        printf("%s\n", buff);
    }

1. Whatever user types
2. Compilation error
3. Undefined behaviour
4. Nothing
5. None of these

Correct Option: A

Whatever user types