What is one restriction when configuring authentication through Federated User Registries?

A.
A username cannot exist in more than one registry.

B.
Federated User Registries must be configured using the Integrated Solutions Console.

C.
Federated User Registries can be configured to utilize no more than one LDAP environment.

D.
Federated User Registries must be configured to authenticate with the local operating system.