Which of the following should be used for freeing the memory

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Which of the following should be used for freeing the memory allocated in the following C code?

#include <stdio.h>
    struct p
    {
        struct p *next;
        int n;
    };
    int main()
    {
        struct p *ptr1 = (struct ptr*)malloc(sizeof(struct p));
        ptr1->n = 1;
        ptr1->next = (struct ptr*)malloc(sizeof(struct p));
        return 0;
    }

free(ptr1);
```
free(ptr1);
   free(ptr1->next)
```
```
free(ptr1->next);
   free(ptr1);
```
All of above
None of these

Correct Option: C

free(ptr1->next);
   free(ptr1);