You are the network administrator for The network consists of a sing Active Directory domain named All domain controllers run Windows Server 2003. All client computers run Windows XP Professional with default settings. Some users have portable computers, and the rest have desktop computers. You need to ensure that all users are authenticated by a domain controller whenthey log on. How should you modify the local security policy?（）

A. Require authentication by a domain controller to unlock the client computer.
B. Cache zero interactive logons.
Cache 50 interactive logons.
D. Grant the Log on locally user right to the Users group.