[单项选择]若有以下程序:# include <iostream>using namespace std;void sub(int x, int y, int *z){ *z = y+x;}int main ( ){ int a,b, c; sub[8,4.&a) ; sub (6, a, &b) ; sub (a.b, &c) ; cout<<a<<" , "<<b<<", "<<c<<end1; return 0;} 程序运行后的输出结果是 A. 12,18,30 B. -12,6,8 C. 6,8,10 D. 12,-18,16