The correct answer is option B – Unlisted group The App Builder should recommend an unlisted is universal container would like a chatter group that is not visible for non-members to see or join, and can be accessed by invite only.
An unlisted group is similar to private group because both only give members access to view an unknown group’s detail page, feed, or files and non-members cannot access the group, but unlisted group provides more privacy than a private group, in that, an unknown group is not visible for non-members to see or join, and can be accessed by invite only as only group owners and group managers can add a member. Member cannot ask to join.