Question: What triggers the SMF to decide that the PDU Session Anchor (PSA) needs to be changed for an Ethernet PDU Session?
Option 1: Receipt of a Path Switch Request Ack message from the RAN
Option 2: A mobility event, such as receiving a message indicating handover preparation and execution
Option 3: An update in the Ethernet context reported by the Source UPF
Option 4: The establishment of a new N4 session at the Target UPF
Explanation: According to the procedure described, the SMF decides that the PSA is to be changed for the Ethernet PDU Session and selects the Target UPF based on an update in the Ethernet context reported by the Source UPF (step 6). This indicates that a change in the Ethernet context triggers the SMF's decision to relocate the PDU Session Anchor.