Question: In E-UTRAN, what is the primary purpose of the PARTIAL RESET CONFIRM message exchanged between nodes capable of EN-DC (E-UTRA-NR Dual Connectivity) interaction?
Option 1: To establish new resources for incoming UEs (User Equipment) at a neighboring node.
Option 2: To synchronize the state of all UEs between two eNBs (evolved Node B) during a handover procedure.
Option 3: To request additional resources from a neighboring node for load balancing.
Option 4: To confirm the release of all resources for selected UEs at a neighboring node.
Explanation: The PARTIAL RESET CONFIRM message is used to confirm that resources have been released for certain UEs, crucial for efficient resource management between interacting nodes. This does not involve allocating new resources, synchronizing UE state during handover, or requesting resources for load balancing.