4. Given typedef struct node ( struct node *next; int data; Node; void foo (struct node* head) printf ("%d ", head->data); if (headNULL) return; printf("%d ", head->data); foo (head->next) What is the output of the function foo(H), where H is the head of the following a linked list H->1-2->3->4->5->NULL A. 1234:5 B. 54321 C. 12 345543 21 D. Nothing will be printed E. None of the above