Question: In a 3GPP Evolved Packet Core (EPC) network with Lawful Interception (LI) activated, which node(s) can intercept Content of Communication (CC), considering their handling of control and user planes?
Option 1: MME (Mobility Management Entity) and HSS (Home Subscriber Server)
Option 2: S-GW (Serving Gateway) and PDN-GW (Packet Data Network Gateway)
Option 3: Only H-PCRF (Home Policy and Charging Rules Function) in case of local breakout
Option 4: LI LCS Client and MME
Explanation: This is because the S-GW handles both control and user planes, allowing for interception of CC, and the PDN-GW, which also handles user plane traffic, can intercept CC as a national option. In contrast, the MME only handles the control plane, making CC interception inapplicable there, and HSS handles signaling, not user plane traffic, thus cannot intercept CC. H-PCRF's role in LI is For Further Study (FFS), and LI LCS Client's primary function isn't directly related to CC interception in this context.