单项选择题

有如下程序:
#nclude ＜iostream＞
using namespace std;
class Base public:
void fun1() cout ＜＜ "Base\n";
virtual void fun2() cout ＜＜ "Base\n";
;
class Derived: public Base public:
void fun1() cout ＜＜ "Derived\n";
void fun2() cout ＜＜ "Derived\n"; void f(Base& b) B. fun1(); B. fun2();
int main()Derived obj;
f(obj);
return 0;

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