Ursa Major Solar (UMS) wants a place within Salesforce to discuss sensitive records. UMS would like to be able to add new members but does not want…

An Unlisted Chatter Group is designed for discussions involving sensitive information where both the content and the group's existence must be kept private. Only group members and users with the "Manage Unlisted Groups" permission can see the group, its feed, or its files. The group is excluded from list views and search results for non-members, directly fulfilling the requirement that non-members cannot see any information about the forum. This ensures the highest level of privacy available for a collaborative space in Chatter.

B. Chatter Private Group: Incorrect because while the posts are private, the group itself is visible. Non-members can see the group's name, description, and member list in search results.

C. Chatter Public Group: Incorrect as this group type is visible and accessible to all users in the organization, making it entirely unsuitable for sensitive discussions.

D. Private Chatter Channel: Incorrect as "Chatter Channel" is not a standard, configurable feature in Salesforce for this purpose. Chatter uses "Groups" for collaboration forums.

1. Salesforce Help Documentation, "Chatter Group Visibility": This document explicitly compares group types. For Unlisted Groups, it states, "Only group members and users with the Manage Unlisted Groups permission can see and add posts, comments, and files. Unlisted groups don’t appear in list views, feeds, or search results for nonmembers." This directly supports the answer.

2. Salesforce Trailhead, Module: "Chatter Administration for Lightning Experience", Unit: "Set Up Chatter Groups": This official training material clarifies the distinction: "Unlisted groups are the most private. They’re invite-only and don’t appear in list views or search results. Only members can see an unlisted group’s detail page, feed, or files."

3. Salesforce Help Documentation, "Considerations for Unlisted Groups": This page reinforces the privacy model: "Unlisted groups offer more privacy than private groups. Only members of an unlisted group can access the group's details, feed, or files."