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 n;
    int main()
    {
        extern int n;
        if (p == 0)
            printf("Scope rules follow here\n");
    }

1. Scope rules followed
2. Nothing will be printed as value of n is not zero because i is an automatic variable
3. Compile time error due to multiple declaration
4. Compile time error due to not defining type in statement extern n
5. None of these

Scope rules followed