下面程序的功能是建立一个有3个结点的单循环链表，如下图所示然后求各个结点数值域data中数据的和，请填空。

#include ＜stdio.h＞
#include
struct NODE
int data;
struct NODE *next;
;
main()
struct NODE *p,*q,*r;
int sum=0;
p=(struct NODE *)malloc(sizeof(struct NODE));
q=(struct NODE *)malloc(sizeof(struct NODE));
r=(struct NODE *)malloc(sizeof(struct NODE));
p-＞data=100; q-＞data=200; r-＞data=300;
p-＞next=q; q-＞next=r; r-＞next=p;
sum=p-＞data+p-＞next-＞data+r-＞next-＞next______;
printf("%d\n",sum);

Virtualization is an approach to IT that pools and shares (1) so that utilization is optimized and supplies automatically meet demand. Traditional IT environments are often silos, where both technology and human (2) are aligned around an application or business function. With a virtualized (3) , people, processes7 and technology are focused on meeting service levels, (4) is allocated dynamically, resources are optimized, and the entire infrastructure is simplified and flexible. We offer a broad spectrum of virtualization (5) that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources.

(3)

A．system

B．infrastructure

C．hardware

D．link