有以下程序：
#include ＜stdio.h＞
main()
FILE *fp; int i, a[6]=1,2,3 ,4,5,6;
fp=fopen("d3.dat","w +b");
fwrite(a,sizeof(int), 6, fp);
fseek(fp, sizeof(int)*3, SEEK_SET)；/*该语句使读文件的位置指针从文件头向后移动3个int型数据*／
fread(a, sizeof(int), 3, fp); fclose(fp);
for(i=0; i＜6; i++) printf("%d,", a[i]);
程序运行后的输出结果是
A) 4,5,6,4,5,6,
B) 1,2,3,4,5,6,
C) 4,5,6,1,2,3,
D) 6,5,4,3,2,1,
