* Site User Visibility Setting:
* When "Site User Visibility" is turned off, external users cannot search for or view other external users within the community.
* This setting helps maintain privacy and control user visibility.
* Why Option B is Correct:
* Disabling Site User Visibility directly impacts the ability to search for other external users.
* Why Others Are Incorrect:
* Option A: Updating their user profile is unrelated to this setting.
* Option C: Internal user visibility is not affected by this setting.
For further guidance, see Salesforce Community Sharing Settings documentation: https://help.salesforce.com/