Question: In a Network-Requested PDP Context Activation procedure, what is a prerequisite for the GGSN (Gateway GPRS Support Node) to initiate the activation of a PDP (Packet Data Protocol) context for a received PDP PDU?
Option 1: Dynamic allocation of a new IP address for the MS (Mobile Station)
Option 2: Existence of a previously established PDP context for the same APN (Access Point Name)
Option 3: Availability of static PDP information about the PDP address in the GGSN
Option 4: Receipt of a specific activation request from the MS
Explanation: For the GGSN to initiate the Network-Requested PDP Context Activation procedure, it must have prior knowledge about the PDP address to determine if activation is supported. This knowledge comes in the form of static PDP information, which is essential for deciding whether to proceed with the activation process for a received PDP PDU when no existing PDP context is found.