You are designing a strategy for migrating the UNIX user accounts to Active Directory. Which three actions should you perform?（）

A、Import the user accounts as inetOrgPerson objects.  

B、Import the user accounts into Active Directory by using the Ldifde command-line tool. 

C、Export all user accounts from the UNIX servers to a text file.  

D、Export all user accounts and their passwords from the UNIX servers to a text file. Encrypt this file to achieve extra security.  

E、Assign random passwords to each user object, and securely distribute the password to the users.  

F、Create the same strong password for each user object, and require users to change their passwords at first logon.