Consider the following C++ code:     class Base {     public:         void show() { std::cout << "Base::show" << std::endl; }     };     class Derived : public Base {     public:         void show() { std::cout << "Derived::show" << std::endl; }     };     int main() {         Base b;         Derived d;         Base* ptr = &d;         ptr->show();         return 0;     }     What will be the output of this code?