About Question enthuware.ocpjp.v11.2.3347 :

[brintal]

Shouldn't the 3rd answer option be

Implement only writeReplace method to replace the instance with a serial proxy and not readResolve.

instead of

Implement only writeReplace method to replace the instance with a serial proxy and not readReplace.

?

There is no method readReplace involved in deserialization.

[admin]

Yes, it should be readResolve. Fixed.
thank you for your feedback!