Question: In a GPRS network, when a Serving GSN Node (SGSN) initiates a Delete PDP Context procedure, what is the primary purpose of including an appropriate cause code in the request to the Gateway GSN Node (GGSN)/Packet Data Network Gateway (P-GW)?
Option 1: To notify the UE (User Equipment) about the reason for context deletion
Option 2: To enable the HPLMN (Home Public Land Mobile Network) operator to differentiate between failure and non-failure related deletions for potential O&M (Operations & Maintenance) actions
Option 3: To trigger an immediate re-establishment of the PDP context with revised QoS parameters
Option 4: To update the SGSN's own records without notifying the GGSN/P-GW
Explanation: The inclusion of a cause code by the SGSN when initiating a Delete PDP Context procedure is crucial for the HPLMN operator to understand the reason behind the deletion. This differentiation allows the operator to take appropriate O&M actions if necessary, which is vital for network management and troubleshooting.