Question: When linking a TDF session to a Gx session, what additional information (if available) may the PCRF use besides matching UE IP addresses or prefixes?
Option 1: IMSI (International Mobile Subscriber Identity)
Option 2: PDN (Packet Data Network) information from the Called-Station-Id AVP
Option 3: APN (Access Point Name) from the UE's initial Attach Request
Option 4: bearers' QoS (Quality of Service) parameters
Explanation: According to the specified behavior for linking TDF and Gx sessions, besides matching UE IPv4 addresses or UE IPv6 prefixes, the PCRF may also utilize PDN information if available in the Called-Station-Id AVP to facilitate this session linking. This approach enhances the accuracy of associating the correct sessions, especially in scenarios with multiple simultaneous traffic flows for the same UE IP prefix.