Question: What are the primary purposes of the S1-interface management functions in E-UTRAN?
Option 1: To manage UE mobility and handle handover procedures between eNodeBs.
Option 2: To optimize network resource allocation for improved QoS (Quality of Service).
Option 3: To ensure a defined start of S1-interface operation and handle protocol errors or version discrepancies.
Option 4: To facilitate direct communication between User Equipment (UE) and the Serving Gateway.
Explanation: The correct answer, Option 3, aligns with the specified functions of S1-interface management, which are to ensure a controlled initiation of the S1 interface (reset) and to manage discrepancies arising from different implementation versions or protocol errors. This is crucial for maintaining seamless communication between the eNodeB and the EPC (Evolved Packet Core) over the S1 interface. The other options are incorrect because they describe functions unrelated to the primary purposes of S1-interface management as outlined in the context provided.