what is the output :

class Base $\{$

public void Print $()\{$

$\}$

$\}$

System.out.print $("$Base$")$;

class Derived extends Base $\{$ public void Print $()\{$

System.out.print $("$Derived$")$;

$\}$

$\}$

class Main$\{$

public static void DoPrint $($ Base o $)\{$ o$.$ Print$()$;

$\}$

public static void main$($String$[]$ args$)\{$ Base x $=$ new Base$()$;

Base y $=$ new Derived$()$; Derived z $=$ new Derived$()$;

DoPrint $($x$)$;

DoPrint $($y$)$;

DoPrint $($z$)$;

$\}$

$\}$