下列代码中的输出是():

class Base {
public:
Base()
{ cout<<"Constructing Base \n"; }
~Base()
{ cout<<"Destructing Base \n"; }
};
class Derived: public Base {
public:
Derived()
{ cout<<"Constructing Derived \n"; }
~Derived()
{ cout<<"Destructing Derived \n"; }
};

int main(void)
{
Derived *d = new Derived();
Base *b = d;
delete b;
return 0;
}