About Question enthuware.ocajp.i.v8.2.1439 :

[enlait]

Answer "b, c(), as well as, d() can be accessed by ref." - seems to either contain a stray comma or miss something.

In the explanation, members a and b are mixed up. b is private, but explanation seems to refer to it as default. a is default, but referred to as private.

[admin]

You are right. Fixed.
thank you for your feedback!
Paul.