Example $3$: Inheritance

$=$ Consider the following $C++$ class definition:

public class AClass$\{$

private:

int $x,y$;

public:

Aclass $($int $a,$ int $b)$ : x$($a$),$ y$($b$)\{\}$

int addEm$()$ i

return $x+y$;

$\}$

$...$

$\}$

You want to derive a subclass from AClass called BClass. BClass will have a third int instance data, $z.$ Which of the following would define BClass's constructor?

a$.$ BClass $($int $a,$ int $b,$ int $c)$: AClass $($a$,$ b$),$ z $($c$)$ f

$$

b$.$ BClass $($int a$,$ int b$,$ int c$)(x=a$;$y=b$;$z=c$; $\}$

c$.$ BClass $($int $a,$ int $b,$ int $cz=C$;

AClass $($a$,$ b$)$ ; $\}$

d$.$ BClass$($int $a,$ int $b,$ int $c)$ : $z($c$)1$

AClass $($a$,$ b$)$ ; $\}$