Which of the following is the correct output for the program

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Which of the following is the correct output for the program given below?

#include <studio.h>
int main()
{
       extern int k;
       printf("%d\n", k );
       return 0;
}
int k = 30;

1. 30
2. 0
3. Garbage value
4. Error

Correct Option: A

No error, When we use extern keyword with uninitialized variable compiler think variable has initialized somewhere else in the program while when we don't use extern keyword then compiler initialized it with default value.

So output is 30.