设rear是指向非空带头结点的循环单链表的尾指针，则删除起始结点的操作可表示为( )

A．s=rear;
B．rear=rear—＞next; rear=rear—＞next; free(rea; free(;
C．rear=rear—＞next—＞next;
D．s=rear—＞next—＞next; free(rea; rear—＞next—＞next=s—＞next; free(;