How can a SAML metada file be used?

How can a SAML metada file be used?
A . To defined a list of trusted user names
B. To import the required IDP configuration
C. To correlate the IDP address to its hostname
D. To resolve the IDP realm for authentication

Answer: B

Explanation:

A SAML metadata file can be used to import the required IDP configuration for SAML service provider mode. A SAML metadata file is an XML file that contains information about the identity provider (IDP) and the service provider (SP), such as their entity IDs, endpoints, certificates, and attributes. By importing a SAML metadata file from the IDP, FortiAuthenticator can automatically configure the necessary settings for SAML service provider mode.

Reference: https://docs.fortinet.com/document/fortiauthenticator/6.4.0/administration-guide/906179/saml-service-provider#saml-metadata