Question: In the context of Lawful Interception (LI) for 3G security, what is the primary purpose of using a correlation number provided by the PDG or AAA server in relation to an I-WLAN tunnel?
Option 1: To authenticate User Equipment (UE) across different networks.
Option 2: To encrypt data transmitted over HI2 and HI3 interfaces.
Option 3: To bill subscribers based on their data usage per I-WLAN tunnel.
Option 4: To correlate Content of Communication (CC) with Intercept Related Information (IRI) for a specific I-WLAN tunnel.
Explanation: The correlation number is crucial for linking the Content of Communication (CC) with Intercept Related Information (IRI) specifically for each I-WLAN tunnel, ensuring that intercepted data can be accurately associated and analyzed. This is vital for effective Lawful Interception operations.