About Question enthuware.ocajp.i.v7.2.903 :

[ETS User]

Option 4 states:

MyI is a valid class that correctly implements interface I.

MyI in the code does not implement the interface... Although the code defines a method that has the same signature as the abstract method in the I interface.

[Guest]

If it did implement interface I it would need to change its access modifier from default to public since interface methods are implicitly public and abstract.

[admin]

You are right. The explanation is wrong and has now been fixed.
thank you for your feedback!