YouneedtochangethehostnameandIPaddressofaserver.Withoutmanuallyeditingalloftherequiredfiles，whichcommandcanberuntorestoreasystemconfigurationtoanunconfiguredstate，readytobereconfiguredagainrestoreasystemconfigurationtoanunconfiguredstate，readytobereconfig

YouneedtochangethehostnameandIPaddressofaserver.Withoutmanuallyeditingalloftherequiredfiles，whichcommandcanberuntorestoreasystemconfigurationtoanunconfiguredstate，readytobereconfiguredagainrestoreasystemconfigurationtoanunconfiguredstate，readytobereconfiguredagain？（）

A./usr/sbin/sys-unconfig

B./usr/sbin/unconfig

C./sbin/ipconfig

D./usr/sbin/set_parmsinitial