Which of these classes compile and will include a default constructor created by the compiler? $($Choose all that apply$)$

public class Bird $\{\}$

public class Bird $\{$ public bird$()\{\}\}$

public class Bird $\{$ public bird$($String name$)\{\}\}$

public class Bird $\{$ public Bird$()\{\}\}$

public class Bird $\{$ Bird$($String name$)\{\}\}$

public class Bird $\{$ private Bird$($int age$)\{\}\}$

public class Bird $\{$ public Bird bird$()\{$return null;$\}\}$