Question: What is the primary purpose of the SgNB Reconfiguration Completion procedure in E-UTRAN, as related to UE operations?
Option 1: To initiate a new security context between the en-gNB and the UE.
Option 2: To manage the mobility of UEs between different SgNBs.
Option 3: To report UE capability updates to the serving en-gNB.
Option 4: To confirm to the en-gNB whether a requested configuration was successfully applied by the UE.
Explanation: The correct answer, Option 4, aligns with the stated purpose of the SgNB Reconfiguration Completion procedure, which is to inform the en-gNB about the success or failure of applying a requested configuration to the User Equipment (UE). This procedure is crucial for ensuring that both the network and the UE are synchronized in terms of configurations, which is vital for maintaining seamless communication services. The other options do not accurately reflect the primary purpose of this specific procedure as described.