Top-level class modifiers?

[Jason]

This question appear in IBM mock exam:
I doubt if there is a correct answer:
8)
Which of the following declarations of a top-level class Frog are legal, assuming Animal is an existing class?

a) protected class Frog extends Animal {

b) private class Frog extends Animal {

c) transient class Frog extends Animal {

d) native class Frog extends Animal

Any help will be appreciated!

[Ankur Gupta]

protected and private can't be used with a top level class, as I understand. native and transient also can't be used for a class.
So, looks like we have a question for errata!!

[Manish Kumar]

Hi,
Jason
You are right. There isn't any correct answer, because a top-level class can only be public or 'friendly'.
Manish

[ryan headley]

I believe top level classes can have no modifier as well (which is known as default
class Test
{
public static void main(String args[])
{
System.out.println("Hello World!");
}
}
That should compile and print out Hello World. The class in this case is not public private or protected, but it is default.