Question: What triggers the target NG-RAN node to update the time UE stayed in cell of the latest PSCell entry during a handover procedure?
Option 1: When the UE successfully accesses a candidate cell of the target NG-RAN node.
Option 2: When the source NG-RAN node sends a Handover Request message to the target NG-RAN node.
Option 3: When the MN initiates an SN Modification procedure.
Option 4: When the SN receives SCG UE history information from the MN.
Explanation: The correct answer is Option 1 because, according to the text, when the target NG-RAN node receives the SCG UHI from the source NG-RAN node via Handover Request message for CHO, it updates the time UE stayed in cell of the latest PSCell entry (i.e. the source PSCell) when the UE successfully accesses to a candidate cell of the target NG-RAN node.