[c++] Given the following simplified classes, which of the statements are not legal? Explain your answer your answer in detail.

class Pet

{

public:

virtual void print();

string name;

private:

};

class Dog: public Pet

{

public:

void print();

string breed;

};

//code below is in the main()

Dog dog;

Pet pet;

dog.name = "rover";

dog.breed = "Collie";

a. pet = dog; cout << dog.name;

b. pet = dog; cout << dog.breed;

c. pet = dog; cout << pet.name;

d. pet = dog; cout << pet.breed;