Question: What is a key consideration for the initiating node when removing an EN-DC X2 interface instance if the signalling transport is shared among multiple X2-C instances?
Option 1: Immediately terminate all associated TNL associations to free up resources.
Option 2: Ensure the removal procedure only affects non-UE-associated signaling.
Option 3: Verify the en-gNB and eNB have synchronized clocks before initiation.
Option 4: Refrain from removing the TNL association if it's still used by one or more X2-C interface instances.
Explanation: This is correct because, as specified, if the signalling transport (TNL association) is shared among several X2-C interface instances and is still in use by at least one instance, the initiating node should not initiate its removal to avoid disrupting active communications. This ensures continuity of service for ongoing sessions on other instances sharing the same transport.