Question: Which of the following scenarios is NOT a primary reason for initiating the Iu Release procedure in the UTRAN?
Option 1: Completion of transaction between the UE (User Equipment) and the CN (Core Network), with all resources still active.
Option 2: Detection of two simultaneous Iu connections in the same domain towards one UE.
Option 3: Establishment of a new RAB (Radio Access Bearer) for an existing Iu connection, indicating ongoing activity.
Option 4: UTRAN-generated reasons, such as reception of an IU RELEASE REQUEST message due to internal errors.
Explanation: The Iu Release procedure is primarily initiated when there's a need to release resources due to inactivity or completion of transactions, not when new activity or resource establishment (like a new RAB for an existing connection) occurs. Establishing a new RAB indicates ongoing communication needs, contradicting the purpose of the Iu Release procedure, which focuses on releasing unused resources.