Question: What is the purpose of including the Non-3GPP Path Switching Information IE in a registration procedure for mobility registration update?
Option 1: To request the network to release user plane resources of the old non-3GPP access.
Option 2: To inform the network about the UE's capability to support path switching.
Option 3: To request the network to keep using the user plane resources of the old non-3GPP access during path switching to the new non-3GPP access.
Option 4: To indicate the UE's preference for a specific non-3GPP access technology.
Explanation: The correct answer is Option 3 because including this IE allows the UE to request the network to keep using the existing user plane resources of the old non-3GPP access during path switching, ensuring continuity of service.