Question: In a 3GPP network, during a Routing Area (RA) update, which statement is true regarding the generation and sending of an update-event by the Serving GPRS Support Node (SGSN)?
Option 1: Only the new SGSN sends the update-event, containing elements about the new location, to the Delivery Function 2 (DF2).
Option 2: Both the old and new SGSNs are required to send the update-event to the DF2, with comprehensive new location elements.
Option 3: The old SGSN is mandated to send the update-event, while the new SGSN may optionally send it, both potentially lacking comprehensive new location details.
Option 4: Neither the old nor the new SGSN sends an update-event to the DF2 during a routine RA update.
Explanation: When a User Equipment (UE) performs a Routing Area Update, the new SGSN is responsible for sending an update-event with new location elements to the Delivery Function 2 (DF2) if available. The old SGSN may optionally send this event but might lack comprehensive details about the new location.