Answer:
The correct answer is A. Unlisted group The App Builder should recommend an unlisted group
Explanation:
Because 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 provides more privacy than a private group, because an unlisted group known 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. unlike private group members cannot ask to join because they do not know that it exist.