Question: When requesting subscription information from the Subscription Profile Repository (SPR), what must the Policy and Charging Rules Function (PCRF) typically specify in the request for an IP-CAN session or gateway control session establishment?
Option 1: Subscriber ID and PDN Identifier (if available)
Option 2: User Equipment (UE) Location and Application Detection Preferences
Option 3: Current QoS Settings and Bearer Identifiers
Option 4: IP Address Allocation and Port Numbers
Explanation: The PCRF needs to identify the subscriber accurately to retrieve the correct subscription information from the SPR. Specifying the Subscriber ID is mandatory for this purpose, while including the PDN Identifier (if available) provides additional context for the IP-CAN or gateway control session, enabling more precise policy and charging decisions.