Question: What is the primary purpose of the Interface Instance Indication in the X2 Application Protocol (X2AP) for Evolved Universal Terrestrial Radio Access Network (E-UTRAN)?
Option 1: To authenticate User Equipment (UE) across different eNodeBs.
Option 2: To identify the specific interface instance(s) an X2AP message is intended for.
Option 3: To manage Quality of Service (QoS) parameters for dedicated bearers.
Option 4: To synchronize X2-C interface instances between neighboring eNodeBs.
Explanation: The correct answer highlights the key function of the Interface Instance Indication - to direct X2AP messages to their intended interface instance(s) within the E-UTRAN's X2-C interface, ensuring efficient and targeted communication between eNodeBs.