Question: Which entity assigns the identifier value for a Routing-Rule-Identifier AVP in the context of an IP flow mobility routing rule?
Option 1: Only the Policy and Charging Enforcement Function (PCEF)
Option 2: Only the Policy and Charging Rules Function (PCRF)
Option 3: Either the PCEF or the PCRF, depending on the rule type
Option 4: The User Equipment (UE) initiates the assignment process
Explanation: According to specifications for IP flow mobility routing rules, the identifier value for a Routing-Rule-Identifier AVP is assigned by the Policy and Charging Enforcement Function (PCEF) when it instructs the PCRF to install such a rule, highlighting the PCEF's role in managing and enforcing policy decisions at the network's edge.