下列代码执行后的输出顺序是（ ）。

class Base {
public:
    Base() {
        cout << "B ";
    }
    virtual ~Base() {
        cout << "~B ";
    }
};

class Derived : public Base {
public:
    Derived() {
        cout << "D ";
    }
    ~Derived() {
        cout << "~D ";
    }
};

int main() {
    Base *p = new Derived();
    delete p;
    return 0;
}