下列程序执行后的输出结果是void func1(int i);void func2(int i);char st[]="hello,friend!";void func1(int i){ printf("%c",st[i]);if(i<3){i+=2;func2(i);}}void func2(int i){ printf("%c",st[i]);if(i<3){i+=2;func1(i);}}void main(){int i=0;func1(i);}

A. hello
B. hel
C. hlo
D. hlm