You have a stand-alone server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2). A user named User1 is a member of the Administrators group on Server1. User1 attempts to log on to Server1 and receives the following error message. Other members of the Administrators group can log on to Server1. You need to ensure that User1 can log on to Server1. What should you do? （）

• A、From the properties of the User1 account, modify the Session settings.
• B、From the properties of the User1 account, modify Environment settings.
• C、From the local security policy on Computer1, modify the Deny log on locally setting.
• D、From the local security policy on Server1, modify the Impersonate a client after authentication setting.