Question: In Dual Connectivity operations, which of the following procedures is NOT primarily initiated by an M-NG-RAN-node (Master NG-RAN node) as per standard practices?
Option 1: S-NG-RAN-node (Secondary NG-RAN node) initiated S-NG-RAN-node Modification
Option 2: M-NG-RAN-node initiated S-NG-RAN-node Release
Option 3: M-NG-RAN-node initiated S-NG-RAN-node Addition Preparation
Option 4: RRC Transfer
Explanation: In the context of Dual Connectivity procedures, the correct answer is Option 1 because it specifically mentions an action ("S-NG-RAN-node initiated S-NG-RAN-node Modification") that is initiated by the Secondary NG-RAN node (S-NG-RAN-node), not the Master NG-RAN node (M-NG-RAN-node). The other options either directly involve initiation by the M-NG-RAN-node or are procedures (like RRC Transfer) that don't explicitly specify the initiating node in this context, making them less fitting as the correct answer based on the question's criteria.