Question: In an E-UTRAN setup, what is the primary characteristic of the 'Target eNB to Source eNB Transparent Container' Information Element (IE) in relation to the Evolved Packet Core (EPC)?
Option 1: It initiates a direct communication link between the EPC and the target eNB for handover optimization.
Option 2: It is used by the EPC to authenticate the source eNB before proceeding with the handover process.
Option 3: It contains encrypted data that only the EPC can decipher for secure handover management.
Option 4: It remains transparent to the EPC, being primarily exchanged between the target and source eNBs for handover purposes.
Explanation: The correct answer highlights the IE's transparency to the EPC, emphasizing its role in direct communication between eNBs (target and source) during handovers, without requiring EPC intervention or awareness of its contents. This is crucial for efficient inter-system handovers, especially to E-UTRAN, as it streamlines the process by not involving the EPC in the exchange of this specific information element.