Answer the questions related to the following code:                                

class X

{

public:

void x1();

protected:

void x2();

};

class Y: public X

{

void y1();

protected:

void y2();

};

class Z : public Y

{

Public:

void z1();

};

main ()

{

X temp1;             Y temp2;               Z temp3;

}

• Name all member functions of all classes visible through temp1 in the main function.
• Name all member functions of all classes visible through temp2 in the main function.
• Name all member functions of all classes visible through temp3 in the main function.