Question: What action may an en-gNB take if the TDCoverall timer expires before receiving a response to a requested SgNB change?
Option 1: Trigger the MeNB initiated Handover Procedure to re-establish UE connectivity
Option 2: Initiate the SgNB Release procedure to release all allocated resources for the UE
Option 3: Send a repeat SGNB CHANGE REQUEST message with an incremented sequence number
Option 4: Automatically switch to a different RAN (Radio Access Network) technology for the UE
Explanation: Upon expiration of the TDCoverall timer without receiving a response, the en-gNB considers the change request failed. To manage resources efficiently and potentially resolve the connectivity issue, it may initiate the SgNB Release procedure, releasing all resources allocated for the UE at the en-gNB.