Question: Which function enables transparent transfer of requested GERAN System Information between UTRAN and GERAN systems for NACC optimization, involving the Core Network (CN)?
Option 1: S1 Handover Function
Option 2: RIM (Radio Interface Management) Function
Option 3: GTP (GPRS Tunnelling Protocol) Transfer Function
Option 4: MME (Mobility Management Entity) Relay Function
Explanation: The RIM (Radio Interface Management) function is utilized for the transparent transfer of requested GERAN System Information. This process, involving the Core Network (CN), aims to optimize NACC (Network-Assisted Cell Change) by providing UEs with pertinent system information related to GERAN systems. The RIM function's role in facilitating this transparent data exchange highlights its importance in interoperability and optimization between different network technologies within telecom infrastructure.