Mikor nincs class egy java file-ban?

Which of the following statements are correct. Select the one correct answer.

A. Each Java file must have exactly one package statement to specify where the class is stored.

B. If a Java file has both import and package statement, the import statement must come before package statement.

C. A Java file has at least one class defined.

D. If a Java file has a package statement, it must be the first statement (except comments).

A teszt szerint a "d" a helyes, tehát nem feltétlen kell class java file-ba. Én azt hittem mindig kell.