Which of the following declare immutable class

public final class Moose $\{$

$$private final int antlers;

$\}$

public class Caribou $\{$

$$private int antlers $=10$;

$\}$

public class Reindeer $\{$

$$private final int antlers $=5$;

$\}$

public final class Elk $\{\}$

public final class Deer $\{$

$$private final Object o $=$ new Object$()$;

$\}$

Each correct answer represents a part of the solution. Choose all that apply.

A $,$ None of these

B $$ Deer

C $$ Elk

D $$ Reindeer

E $,$ Caribou

F $,$ Moose