执行以下程序的结果为_____。#include int f(int m){static int k=0;int s=0;k=k+m;s=s+k;return s;}main( ){int s1, s2;s1=f(5);s2=f(5);printf("%d %d\n", s1, s2);}

A. 5 5
B. 5 10
C. 10 5
D. 10 10