单选题 有以下程序#include "stdio.h"main( ){ FILE *fp;int k,n,a[6]={1,2,3,4,5,6}; fp=fopen("d2.dat","w"); fprintf(fp,"%d%d%d\n",a[0],a[1],a[2]); fprintf(fp,"%d%d%d\n",a[3],a[4],a[5]); fclose(fp); fp=fopen("d2.dat","r"); fscanf(fp,"%d%d",&k,&n);printf("%d %d\n",k,n); fclose(fp);}程序运行后的输出结果是( )