About Question enthuware.ocpjp.v11.2.3002 :

[jorgeruiz]

Would you expand more in the definition of what is "platform implementation" present in the second option to enhance the explanation?

The module system ensures that code that is internal to a platform implementation is not accessible from outside the implementation.

[admin]

Module system provides even more encapsulation than access modifiers. It prevents reflective access also. Together with support for a robust "service provider" architecture it prevents all accidental dependency on implementation classes.

The phrase "platform implementation" is just a catch phrase used in the official documents and also in option statements in the exam. But it basically just means stronger encapsulation.