What purpose do classes serve?

A$.$ data encapsulation

B$.$ providing a convenient way of modeling real$-$world objects

C$.$ simplifying code reuse

D$.$ all of the above

Which is not a protection level provided by classes in $C++?$

A$.$ protected

B$.$ hidden

C$.$ private

D$.$ public

What value must a destructor return?

A$.$ A pointer to the class.

B$.$ An object of the class.

C$.$ A status code determining whether the class was destructed correctly

D$.$ Destructors do not return a value.

Which of the following is a valid class declaration?

A$.$ class int $x$;