What is the interface between a HSS (Home Suscriber Server) and an MM – McqOptions

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1.	What is the interface between a HSS (Home Suscriber Server) and an MME (Mobility Management Entitiy) of a 3GPP access network in a Non-Roaming VoWi-Fi (or GAN) architecture?
A.	S2a
B.	S2b
C.	S6a
D.	S6
Answer» D. S6

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