What is the order of constructor for object z1 to be invoked?

Question

class x

{int a;

public :

x() {}

};

class y

{ x x1;

public : y()

{} };

class z : public y, x

{ intb;

public:

z(){}

} z1;

What is the order of constructor for object z1 to be invoked?

(a) z, y, x, x

(b) x, y, z, x 

(c) y, x, x, z 

(d) x, y, z

Answer 1

(c) y, x, x, z