What type of identity system allows trust and verifications between the authentication systems of multiple organizations? Response:

Federated identity systems allow for the establishment of trust between disparate identity management systems of multiple organizations. This enables users, once authenticated by their home organization's identity provider, to access resources and services from other organizations (service providers) that trust the initial authentication, facilitating single sign-on across organizational boundaries.

''Collaborative'' is a general term and not a specific technical type of identity system.

''Integrated'' implies combining systems, which can be part of federation, but ''federated'' specifically defines the trust relationship between multiple organizations' authentication systems.

''Bidirectional'' describes a direction of communication or trust, but not the overall type of identity system that enables cross-organizational trust and verification.