Which statement describes the OAuth mechanism?

Which statement describes the OAuth mechanism?
A . An open authorization mechanism that allows a client to access protected resources from a resource server on behalf of a resource owner
B . A network authentication protocol that provides strong authentication for client/server applications by using secret-key cryptography
C . An open authentication standard in which a service provider uses authentication services from an OpenID provider
D . A mechanism designed to examine data packets traversing a network and compare them to a set of filtering rules

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Answer: A