有如下程序:#include <iostream>using namespace std;class Base public: void fun() cout<< Base:: fun <<end1; ;class Derived: public Base ( public: void fun() ____________________________ cout<< Derived:: fun <<end1;;int main() Derived d; D. fun(); return O;已知其执行后的输出结果为:Base:: funDerived:: 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()