The problem is to create a group called sysadm.
abraham needs to be a secondary member of this group.
leah is a secondary member of sysadm group.
rachael has no interactive login is not a member of sysadm.
For simplicity make the password equal to blackhat
Next objective: Make a folder /redhat/sysadm group ownership should be sysadm. /members of sysadm should have read, write and execute permissions. Files in that folder should be inaccessible to all other users. Files in that folder should automatically be a member of group sysadm.
Simple. Nothing fancy.