单项选择题
In configuration mode you see the following prompt： [edit interfaces fe-1/1/1] user@router# Which command will take you to operational mode？（）
A.end B.exit C.quit D.exit configuration-mode
A.The system log has a proprietary format. B.System logs must be sent to a remote device. C.New system logs can be created and archived. D.Most software processes create their own logs.
A.224.0.0.2 B.224.0.0.5 C.224.0.0.9 D.255.255.255.255