Question: What is the purpose of the UL RRC MESSAGE TRANSFER message sent by the target gNB-DU to the gNB-CU in step 10 of the inter-gNB-DU mobility procedure for intra-NR?
Option 1: To convey the UE's MeasurementReport message.
Option 2: To request the latest configuration from the source gNB-DU.
Option 3: To convey the received RRCReconfigurationComplete message from the UE.
Option 4: To release the UE context.
Explanation: The UL RRC MESSAGE TRANSFER message is used to convey the received RRCReconfigurationComplete message from the UE to the gNB-CU, indicating that the UE has successfully reconfigured and is ready for data transmission. This step is crucial in completing the inter-gNB-DU mobility procedure and ensuring seamless handover of the UE between gNB-DUs.