During startup, a Windows 2000 Professional computer in your office proceeds directly to the desktop without first prompting for a user name and password first.  You need to enforce logon requirements. What should you do? （）

• A、Change the Netlogon service startup setting to manual.
• B、Disable the Disable CTRL+ALT+DEL requirement for logon option in the local group policy.
• C、In Control Panel， modify the startup and recovery settings in the system option.
• D、In Control Panel， add the appropriate user accounts to the Users And Passwords setting.