Question: In the context of Lawful Interception for EPS (Evolved Packet System) networks, what information is primarily transferred from EPS nodes (MME, S-GW, PDN-GW) to the Delivery Function 2 (DF2) via the X2-interface to facilitate its operational functionality?
Option 1: Only Cell ID and eNodeB identifiers for location tracking
Option 2: Target identity (IMSI, MSISDN, IMEI) exclusively for subscriber identification
Option 3: Both target identity (IMSI, MSISDN, IMEI) and specific events with associated parameters as defined by interception standards
Option 4: Entire call detail records including all network nodes involved
Explanation: For the Delivery Function 2 (DF2) to effectively perform its role in lawful interception within EPS networks, it requires not just the identity of the target (e.g., IMSI, MSISDN, IMEI) for precise subscriber identification but also specific events and their associated parameters. This comprehensive information enables the DF2 to accurately intercept and deliver the required communications data as mandated by law enforcement or regulatory bodies, highlighting its importance in both technical and legal aspects of telecommunications surveillance.