Cameron's SCJA Guide: wrong answer?

[Vopli Vidoplyasova]

I'm studying Cameron's SCJA Certification Guide and the answer to one of the questions in "15 Questions: Java Technology" section seems suspicious to me. Here's the question:

Which of the following would be considered to be typical, J2EE application design best practices?

There's four possible answers (it's a multiple choice question), but here's the interesting one:

c) Entity beans should have remote interfaces, while session EJB's should have local interfaces

In the answers this one is said to be correct, and here's the explanation why:

"EJB's can have either remote or local interfaces, and in fact, they can even have both. Entity beans typically have local interfaces, in order to provide a greater level of security over the data they represent. Session EJB's typically have remote interfaces in order to support remote distribution and client access."

Am I missing something or question and answer say about completely opposite things? Again, I understand you can have any interfaces with any EJB's, but the question is talking about "application design best practices", right?
[ December 01, 2008: Message edited by: Slava Golovachenko ]

[Stephen Davies]

Actually, I also noticed that today, I think it is an error. Cameron, have you been made aware of this?

[K. Tsang]

OK I'm no J2EE/EJB expert but have done a bit of EJB, I personally say choice (c) is NOT a design best practice. Yet the explanation truly holds.