Your network contains an Active Directory domain. The domain contains 1,000 user
accounts.
You have a list that contains the mobile phone number of each user. You need to add the
mobile number of each user to Active Directory.
What should you do?

A.
Create a file that contains the mobile phone numbers, and then run ldifde.exe.

B.
Create a file that contains the mobile phone numbers, and then run csvde.exe.

C.
From Adsiedit, select the CN=Users container, and then modify the properties of the
container.

D.
From Active Directory Users and Computers, select all of the users, and then modify the
properties of the users.

Explanation:
CSVDE can only import and export data from AD DS.
http://technet.microsoft.com/en-us/library/cc732101.aspx

http://technet.microsoft.com/en-us/library/cc731033.aspx
Ldifde
Creates, modifies, and deletes directory objects.