有如下程序：
#include＜iostream＞
using namespace std;
class Base
protected:
Base()cout＜＜'Base';
Base(char c)cout＜＜c;
;
class Derived:public Base
public:
Derived(char c)cout＜＜c;
;
int main()
Derived d('Derived');
return 0;
执行这个程序屏幕上将显示输出( )。
A) Derived
B) DerivedBase
C) BaseDerived
D) DerivedDerived