Question: In the context of 3GPP Lawful Interception (LI) architecture, what is the primary purpose of the X1 interface as defined in the standardized X interfaces?
Option 1: Transport intercepted Communication Content (CC) to the Mediation Function/Delivery Function (MF/DF)
Option 2: Control interception and transport intercepted Identification Information (IRI) to external entities
Option 3: Manage circuit-switched services for Lawful Interception in CSP implementations
Option 4: Control interception, specifically initiating or terminating the interception process
Explanation: The X1 interface is primarily used for controlling the interception process. This involves sending commands to initiate, terminate, or modify the interception of a target's communications. While other interfaces (like X2) are responsible for transporting intercepted data (e.g., IRI), X1 focuses on the control aspects of lawful interception, ensuring that the interception activities are managed appropriately within the network.