Question: What is the primary purpose of the N4 Session Modification procedure in the 5G System?
Option 1: To establish a new PDU Session at the UPF.
Option 2: To terminate an existing PDU Session at the UPF.
Option 3: To update the N4 session context of an existing PDU Session at the UPF.
Option 4: To retrieve information about an existing PDU Session from the UPF.
Explanation: The N4 Session Modification procedure is used to modify the parameters of an existing PDU Session, allowing the SMF and UPF to update the session context as needed. This ensures that the UPF can adapt its behavior according to changing network conditions or user requirements.