若定义如下结构,则能打印出字母M的语句是()。structperson{charname[9];intage;};structpersonclass[10]={"Wujun",20,"Liudan",23,"Maling",21,"zhangming",22};
①
printf("%c\n",class[3].name);
②
printf("%c\n",class[2].name[0]);
③
printf("%c\n",class[2].name[1]);
④
printf("%c\n",class[3].name[1]);