Question: In a 3GPP network, when lawful interception is initiated at the PDN-GW/ePDG and the target UE has an existing connection, what determines the generation of a 'Start of Interception with Active Tunnel/Bearer' event?
Option 1: The type of UE (User Equipment) being used by the target.
Option 2: The protocol used for the s2b interface (e.g., GTP, PMIP, DSMIP).
Option 3: The number of active bearers the target UE currently has.
Option 4: The specific APN (Access Point Name) the target UE is connected to.
Explanation: The generation of a 'Start of Interception with Active Tunnel/Bearer' event depends on detecting specific protocol usage, indicating that the protocol in use influences how and when such events are triggered and reported.