The correct answer is fully restricted. This level of assignment is designed to ensure that external users can only access information that pertains to their own organization. When an assignment is fully restricted, it establishes clear boundaries that limit access to sensitive or confidential data. This is crucial for maintaining data privacy and security, especially in environments where multiple organizations interact within the same system.
By using a fully restricted assignment, organizations can ensure that external users do not have visibility into other organizations' data, thereby protecting the integrity of all parties involved. It fosters trust and compliance with data protection regulations since external users are confined to viewing and interacting only with data that is relevant to their own organization.
In contrast, other options like protect internal, allow internal, and partially unrestricted do not offer the same level of restriction. They may allow broader access or interactions that could compromise the privacy of data from other organizations, which is why they are not suitable for this scenario.