选择题：有如下程序:#include ＋using namespace std ;#includeusing namespace std;class Base{publ

有如下程序：

#include +

using namespace std ；

#include

using namespace std;

class Base

{

public:

void fun(){cout<<"Base::fun"<

};

class Derived:public Base

{

public:

void fun()

{

cout<<"Derived::fun"<

}

};

int main()

{

Derived d;

d.fun();

return 0;

}

已知其执行后的输出结果为：

Base::fun

Derived::fun

则程序中下划线处应填入的语句是

A ． Base.fun();

B ． Base::fun()

C ． Base->fun()

D ． fun();