Q: Which keyword can protect a class in a package from accessibility by the classes outside the package ?

A private
B protected
C final
D don't use any keyword at all (make it default)

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Answer: D

Explanation:

Accessibility of classes in Java

In Java, top-level classes (i.e., not inner classes) can only have:
- public → accessible from anywhere.
- default (no modifier) → accessible only within the same package.
private and protected cannot be used with a top-level class.
final means the class cannot be inherited, but it doesn’t restrict access across packages.

Now checking the options

(a) private → ❌ Not allowed for a top-level class.
(b) protected → ❌ Not allowed for a top-level class (only applies to members).
(c) final → ❌ Only prevents subclassing, not accessibility.
(d) don’t use any keyword at all (make it default) → ✅ Correct!

A default (package-private) class is accessible only within the same package.
Classes outside the package cannot access it.

✅ Answer: (d) don’t use any keyword at all (make it default)

Q: Which keyword can protect a class in a package from accessibility by the classes outside the package ?

Accessibility of classes in Java

Now checking the options

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