Question
a.
vPCRF interfaces with Serving Gateway and ePDG through Gxc and Gxb interfaces respectively.
b.
hPCRF communicates with PDN Gateway and IP-Services-Element through Gx and Rx interfaces respectively.
c.
A Trusted Non-3GPP access element communicates directly with vPCRF using Gxa interface.
d.
All of the above
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