The biggest advantage of offline defragmentation is ____________________

a. It is faster than online defragmentation
b. It can reduce the size of the ntds.dit file
c. You do not need to restart the server
d. None of the above.

B. Both offline and online defragmentation can fully defragment the AD DS database file, but online defragmentation can never reduce the ntds.dit file's size. Even if the quantity of data in the database has reduced (for example, after deleting numerous objects), the empty space remains within the database. You must perform a manual, offline defragmentation to recover this space.