You are an administrator for an on-premises SharePoint 2016 farm. A partner organization needs access to some of the res

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You are an administrator for an on-premises SharePoint 2016 farm.
A partner organization needs access to some of the resources in the farm. The partner organization does not use Windows Active Directory and does not have third-party signed certificates. The partner organization does not have the personnel or expertise to set up and manage a public key infrastructure (PKI). The partner organization can supply you with a file that lists the users who need access to your SharePoint farm.
All access to SharePoint resources must be authenticated.
You need to configure authentication for the partner organization.
What should you do?

A. Configure a cross-forest trust.
B. Configure anonymous access.
C. Configure a federated relying party trust.
D. Configure forms-based authentication.