问题:设单循环链表中结点的结构为(data, next),且rear是指向非空的带表头结点的单循环链表的尾结点的指针。若想删除链表第一个结点,则应执行下列哪一个操作?选项()
A.A:s = rear->next->next;rear->next = s->next;free(s) B.B: s = rear;rear = rear->next;free(s) C.C:rear = rear->next;free(rear) D.D:rear = rear->next->next; free(rear)