Question: Where is APN rate control DL policing typically performed in the network?
Option 1: In the UE
Option 2: In the Serving PLMN
Option 3: In the HPLMN operator's network
Option 4: In the GGSN/PGW or the SCEF
Explanation: APN rate control DL policing is typically performed in the GGSN/PGW or the SCEF, as these nodes are responsible for controlling the amount of user data sent downstream (DL) to the UE. This allows HPLMN operators to control the amount of user data on a per-APN and per-user basis.