CompTIA Linux+ XK0-006 (V8) Practice Question

The ability to inherit group ownership already comes from the setgid bit (octal 2 in the special-permission digit). Preventing users from deleting or renaming one another's files in a writable directory is accomplished by adding the sticky bit (octal 1 in the special-permission digit). Combining setgid (2) and sticky (1) in the left-most octal digit yields 3, so applying chmod 3775 /srv/teamdata keeps the existing rwx bits while enabling both special permissions.

chmod 1777 would add the sticky bit but remove the setgid bit and make the directory world-writable, violating requirements. chmod g-s removes the setgid bit entirely, breaking group inheritance. chmod 775 removes both special bits, leaving files deletable by any group member. Therefore chmod 3775 /srv/teamdata is the only command that satisfies all stated conditions.