What is the Authentication Server Function (AUSF)?

What is the Authentication Server Function (AUSF)?
A . This network function is part of data repositories in the Common Data Layer. It stores 3GPP standardized data.
B. This network function supports authentication for 3GPP and non-3GPP accesses.
C. This network function exposes 5G Core network functionalities available to 3rd parties, so that 3rd party capabilities and events may be securely exposed by the Network Exposure Function (NEF).
D. This network function stores or retrieves subscriptions, profiles and authentication data to or from the data repositories. It offers services to the AMF, SMF, NEF and AUSF using the Service Based Interface.

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Answer: B