单项选择题

执行如下程序将输出( ):
#include＜iostream＞
using namespace std;
class Base

public:
Base()cout＜＜"BB";fun();
void fun ()tout＜＜"Brim";
;
class Derived:public Base

public:
Derived()cout＜＜"DD";
void fun ()cout＜＜"Dfun";
;
int main()Derived d;return 0;