What is an OpenID mechanism?

A.
A mechanism that examines data packets traversing a network and compares them to a
set of filtering rules

B.
An open standard for authentication in which a service provider uses authentication
services from an identity provider

C.
An open authorization mechanism that allows a client to access protected resources from
a resource server on behalf of a resource owner

D.
A network authentication protocol that provides strong authentication for client/server
applications by using secret-key cryptography

Explanation: