While reading the MS Press 70-640 book I noticed an error, so I went looking for the errata for this book, here are the erratas for

MCTS Self-Paced Training Kit (Exam 70-640): Configuring Windows Server® 2008 Active Directory comments and corrections

http://support.microsoft.com/kb/955243/en-ca

MCTS Self-Paced Training Kit (Exam 70-642): Configuring Windows Server® 2008 Network Infrastructure comments and corrections

http://support.microsoft.com/kb/953194/en-ca

MCTS Self-Paced Training Kit (Exam 70-643): Configuring Windows Server® 2008 Applications Infrastructure comments and corrections

http://support.microsoft.com/kb/951753/en-ca

MCITP Self-Paced Training Kit (Exam 70-646): Windows Server® Administration

<no errata yet>

MCITP Self-Paced Training Kit (Exam 70-647): Windows Server® Enterprise Administration

<no errata yet>

BTW I was right the answer is just "B" on page 888 for Question 2.