Microsoft Entra ID provides External collaboration settings to control which external domains users can invite as guests. To restrict invitations so that only users from fabrikam.com can be invited, you must configure Collaboration restrictions.
Within the External collaboration settings, administrators can:
* Allow invitations only to users from specific domains
* Block invitations to all other external domains
Microsoft Entra documentation specifies that Collaboration restrictions are the control used to define allowed or blocked external domains for B2B guest invitations.
The other options do not meet the requirement:
* Guest user access restrictions control what guests can do after they are invited.
* Cross-tenant access - Tenant restrictions control inbound/outbound access behavior, not invitation eligibility.
* Microsoft cloud settings apply to cloud instances, not domain-based invitations.
Final Verified Answer:
# C. From External collaboration settings, configure the Collaboration restrictions settings.