Question: In a Lawful Interception architecture, what criterion is likely used by a Serving Gateway-U's packet detection rules to determine which user plane packets to duplicate and send to the SX3LIF?
Option 1: UE (User Equipment) IP address
Option 2: PDN (Packet Data Network) type
Option 3: GTP (GPRS Tunneling Protocol) tunnel ID of the bearer
Option 4: Destination Port Number
Explanation: In the context of a Serving Gateway-U, packet detection rules for lawful interception identify and duplicate packets based on unique identifiers associated with specific bearers. The GTP tunnel ID is a key identifier for distinguishing between different bearers in a mobile network, making it the most suitable criterion for determining which user plane packets to intercept at a Serving Gateway-U.