【单选题】

有如下程序:

#nclude ＜iostream＞
using namespace std;
classBase
public:
void fun1() cout ＜＜ "Base\n";
virtual void fun2() cout ＜＜ "Base\n";
;
classDerived: publicBase
public:
void fun1() cout ＜＜ "Derived\n";
void fun2() cout ＜＜ "Derived\n";
void fBase& b)B、fun1();B、fun2();
int main()
Derived obj;
f(obj);
return 0;
A．Base
Base
Base
Derived
C．Derived
Base
Derived
Derived