A systems administrator notices that a user who is a member of the 'data-analysts' group cannot modify files in the 'analytics_reports' directory. The directory permissions are set to drwxrwx---. The user and group ownerships are 'datamgr' and 'data-analysts' respectively. The administrator has verified that the user is indeed a member of the 'data-analysts' group. What should the administrator investigate as the most likely cause of this issue?
The filesystem for the 'analytics_reports' directory is mounted as read-only
The user has not logged out and back in since being added to the group
There is full disk space, preventing any changes to files
There are file-specific ACLs that override group permissions and prevent modifications