Consider the following classes:

public class Book

$\{$

public String getISBN$()$

$\{$

$//$ implementation not shown

$\}$

$//$ constructors, fields, and other methods not shown

$\}$

public class Dictionary extends Book

$\{$

public String getDefinition$($String word$)$

$\{$

$//$ implementation not shown

$\}$

$//$ constructors, fields, and methods not shown

$\}$

The following declarations appears in a different class:

Book b $=$ new Dictionary$()$;

Dictionary d $=$ new Dictionary$()$;

Which of the following statements would compile?

I.

b$.$getISBN$()$;

II$.$

b$.$getDefinition$("$wonderful$")$;

III.

d$.$getISBN$()$;