Question: In UTRAN Iu interface (RANAP) signalling, when a Relocation Complete procedure is initiated by the Target Radio Network Controller (Target RNC), on which of the following does the Target RNC initiate this procedure?
Option 1: All Iu signalling connections existing for the User Equipment (UE) between the Target RNC and the Core Network (CN)
Option 2: Only the primary Iu signalling connection for the UE between the Target RNC and the CN
Option 3: Iu signalling connections related to ongoing voice calls for the UE between the Target RNC and the CN
Option 4: New Iu signalling connections established after relocation for the UE between the Target RNC and the CN
Explanation: This is correct because, according to the specified behaviour for coordinating two Iu signalling connections during a relocation, the target RNC must ensure consistency across all relevant connections. Initiating the Relocation Complete procedure on all existing Iu signalling connections for the UE between the Target RNC and the CN ensures seamless handover and maintains network integrity.