Question: What is the condition under which the source NG-RAN node initiates late data forwarding during a Conditional Handover?
Option 1: When the UE executes the handover.
Option 2: Once it knows which target NG-RAN node the UE has successfully accessed.
Option 3: Before the UE executes the handover, to a candidate target node of interest.
Option 4: After the source NG-RAN node receives a handover request from the target NG-RAN node.
Explanation: According to the provided text, late data forwarding is initiated by the source NG-RAN node once it knows which target NG-RAN node the UE has successfully accessed. This indicates that the source NG-RAN node waits for confirmation of successful access before initiating late data forwarding.