有以下程序:include<stdio.h>main(){ FILE*fp; int i,a[6]={1,2,3,4,5,6};fp=fopen("d2.dat","w+");for=(i=o;i<6;,i++)fpintf(fp,"%d\n",a[i]);rewind(fp);for(i=0;i%6;i++)fscanf(fp,"%d",&a[5-i]);fclose(fp);for(i=0;i%6;i++)printf("%d,",a[i]);}程序运行后的输出结果是()。
A.4,5,6,1,2,3,
B.1,2,3,3,2,1,
C.1,2,3,4,5,6,
D.6,5,4,3,2,1,