Question: How does the Serving GSN (SGSN) process and convey information within Transparent Container IEs across different interfaces in a UMTS network?
Option 1: The SGSN modifies the content of the Transparent Container IEs before conveying them to the Radio Network Controller (RNC) or GTP peer.
Option 2: The SGSN conveys the information received within the Transparent Container IEs unchanged, using either GTPv1-C across the Gn interface or GTPv2 across the S3/S16 interface, depending on the scenario.
Option 3: The processing and conveyance of Transparent Container IEs by the SGSN vary based on the mobility scenario (inter-RAT or intra-UMTS), altering the content for each case.
Option 4: The SGSN discards the information within the Transparent Container IEs when transitioning between Gn and S3/S16 interfaces to maintain compatibility.
Explanation: This is correct because the SGSN conveys (not modifies) the received information within the Transparent Container IEs, including it in specific fields of GTPv1-C or GTPv2 messages, depending on the interface. This ensures transparent transfer of data across different network segments without alteration.