以下程序的输出结果是( )。#include struct st{ int x;int *y;}*p;int dt[4]={10,20,30,40};struct st aa[4]={50,&dt[0],60,&dt[1],70,&dt[2],80,&dt[3]};int main(){ p=aa;printf("%d,",++p->x);printf("%d,",(++p)->x);printf("%d\n",++(*p->y));return 0;}
A. 10,20,20
B. 50,60,21
C. 51,60,21
D. 60,70,31