What will be the output of the following C code?

#include <stdio.h>
struct p
{
   struct p *next;
   int x;
};
int main()
{
   struct p* p1 = malloc(sizeof(struct p));
   p1->x = 1;
   p1->next = malloc(sizeof(struct p));
   printf("%d\n", p1->next->x);
   return 0;
}

A. stdio.h B. iostream.h C. fileio.h D. files.h

A. fopen() B. open() C. writefile() D. createfile()

A. A built-in data type for files B. A file descriptor C. A file pointer D. A file structure

A. Use the 'filestatus' variable B. Check the return value of fopen() C. Use the 'fileopen' function D. Check the file's size