Consider the following class definitions.

public class Data

$\{$

private int $x$;

public void setX$($int $n)$

$\{$

$x=n$;

$\}$

$//...$ other methods not shown

$\}$

public class EnhancedData extends Data

$$

private int $y$;

public void setY$($int $n)$

$\{$

$y=n$;

$\}$

$//...$ other methods not shown

$\}$

Assume that the following declaration appears in a client program.

EnhancedData item $=$ new EnhancedData$()$;

Which of the following statements would be valid?

I. item. $y=16$;

II$.$ item. setY$(16)$;

III. item. setx$(25)$;

$($A$)$ I only

$($B$)$ II only

$($C$)$ I and II only

$($D$)$ II and III only