Before replacing a MAG Series device, using the admin GUI, you export two backup files, system.cfg from "Maintenance" > "ImportfExport Configuration" and user.cfg from "Maintenance" > "Import/Export Users". When you receive the new hardware, you import all of the settings stored in the system.cfg file (including the IP address, network configuration, and device certificates), but you fail to import the user.cfg file. Which three configuration areas were updated by system.cfg?（）

• A、Cluster configuration settings
• B、Static routes
• C、SNMP settings
• D、Sign-in policies
• E、MAC authentication realms