CompTIA Linux+ XK0-006 (V8) Practice Question

The correct command is setfacl -m d:g:project_leads:rw /srv/collaboration. The -m option modifies the ACL. The key part is d:, which stands for default:. This specifies that the entry should be added to the default ACL of the directory. The default ACL is inherited by new files and directories created inside /srv/collaboration. g:project_leads:rw specifies that the group project_leads should receive read and write permissions. The command setfacl -m g:project_leads:rw /srv/collaboration only sets an access ACL on the directory itself, not a default ACL for new files. The command setfacl -R -m g:project_leads:rw /srv/collaboration recursively applies the ACL to all current contents of the directory but does not set the default for new items. chmod g+s /srv/collaboration sets the setgid bit, which makes new files inherit the group ownership of the directory, but it does not specifically grant permissions; the file's umask would still control the initial permissions.