#include <stdio.h>
    void foo(const int *);
    int main()
    {
        const int i = 10;
        printf("%d ", i);
        foo(&i);
        printf("%d", i);
 
    }
    void foo(const int *i)
    {
        *i = 20;
    }

#include <stdio.h>
    int main()
    {
        const int i = 10;
        int *ptr = &i;
        *ptr = 20;
        printf("%d\n", i);
        return 0;
    }

#include <stdio.h>
    int main()
    {
        j = 10;
        printf("%d\n", j++);
        return 0;
    }

#include <stdio.h>
    int main()
    {
        for (int k = 0; k < 10; k++);
            return 0;
    }

#include <stdio.h>
    int main()
    {
        int k;
        {
            int k;
            for (k = 0; k < 10; k++);
        }
    }

#include <stdio.h>
    int main()
    {
        char *var = "Advanced Training in C by Sanfoundry.com";
    }


Which of the following format identifier can never be used for the variable var?