When migrating files from a Windows server A to a Samba server B with the command ’net rpc share migrate files -S A -destination=B -acls -attrs -U administrator’， some files that originally belong only to a Windows group （no user） will generate errors during the migration. Which option in smb.conf will force such files to be mapped to the correct UNIX UID and GID？（）

• A、 use acl = yes
• B、 map group acls = yes
• C、 force unknown acl user = yes
• D、 inherit acls = no