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? （）
- AChange the Netlogon service startup setting to manual.
- BDisable the Disable CTRL+ALT+DEL requirement for logon option in the local group policy.
- CIn Control Panel， modify the startup and recovery settings in the system option.
- DIn Control Panel， add the appropriate user accounts to the Users And Passwords setting.