Question: How do neighbor eNodeBs (en-gNBs) in EN-DC support CSI-RS based Secondary Node (SgNB) change?
Option 1: By exchanging UE-associated signaling.
Option 2: By exchanging their own CSI-RS configurations and on/off status via the Master eNodeB (MeNB).
Option 3: By coordinating sidelink radio resources with each other directly.
Option 4: By using semi-static manner via UE associated signalling.
Explanation: In EN-DC, neighbor en-gNBs support CSI-RS based SgNB change by exchanging their own CSI-RS configurations and on/off status via the MeNB. This allows for efficient resource coordination between nodes in a multi-connectivity scenario.