Question: What is the primary purpose of the Correlation Number in the context of Lawful Interception (LI) in 3GPP networks, considering its uniqueness per PDP (Packet Data Protocol) context?
Option 1: To uniquely identify and correlate various interception records (e.g., CC, IRI, LALS reports) within a single PDP context for a target under lawful authorization.
Option 2: Exclusively for charging purposes, combining GGSN address and charging ID in UMTS systems.
Option 3: To differentiate between concurrent communications of different targets within the same network.
Option 4: Solely to correlate CC with IRI records across all PDP contexts of a single UE (User Equipment).
Explanation: The correct answer, Option 1, highlights the Correlation Number's role in linking various interception-related records (CC, IRI, and LALS reports) within one PDP context. This ensures comprehensive tracking for lawful interception purposes. While Option 2 mentions a possible composition of the Correlation Number in UMTS, it narrows down its purpose too much. Options 3 and 4 misinterpret the scope and application of the Correlation Number as per the given context.