13. What is the output of the following program? #include typedef struct fred int barney [2]; struct fred next; fred; int main (void) fred fl, f2, 13, 14: fred* x; f4.next&f2; f1.barney [0]-3; f1.barney [1]-5; 12.barney [0]-7; f2.barney [1]-6; 12.next&f1; 3.barney [01-2; f3.barney [1]-4; f4.barney [0]-9; 14.barney [1]-8; fl.next NULL; x-64; while (x - NULL) printf("%d",x -> barney [0]); xx->next; return (0);