You need to change the hostname and IP address of a server. Without manually editing all of the required files， which command can be run to restore a system configuration to an unconfigured state， ready to be reconfigured again restore a system configuration to an unconfigured state， ready to be reconfigured again？ （）

• A、 /usr/sbin/sys-unconfig
• B、 /usr/sbin/unconfig
• C、 /sbin/ipconfig
• D、 /usr/sbin/set_parms initial