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;
A．Base
Base
B．Base
Derived
C．Derived
Base
D．Derived
Derived