You want to implement Active Directory on your Windows 2000 network. Your network consists of Windows 2000 Server computers, Windows 2000 Professional computers, Windows NT Workstation 4.0 computers, and Windows 98 computers. You want to achieve optimum functionality of all the client computers with Active Directory. What should you do?

Correct Answer: Upgrade all of the Windows NT Workstation 4.0 computers and Windows 98 computers to Windows 2000 Professional

To achieve optimum functionality of the client computers, you must upgrade all of them to Windows 2000. Upgrading some of them and/or installing the Directory Service Client will gain some functionality, but the question specifically states that "optimum functionality" is the required result.