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.