Your network consists of a single Active Directory domain. The domain contains a server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2). Your company’s security policy states that domain users must be prevented from logging on to Server1 if a domain controller is unavailable. You disconnect Server1 from the network and discover that you can log on to Server1. You need to configure Server1 to comply with the company’s security policy. What should you do on Server1? （）

A. From the local security policy, modify the Security Options.
B. From the local security policy, modify the User Rights Assignment.
C. From Active Directory Users and Computers, modify the properties of the Server1 account.
D. From Active Directory Users and Computers, modify the properties of the Domain Computers group.