Question: In a scenario where a packet domain Public Land Mobile Network (PLMN) interacts with another network to execute a service request, which reference points/interfaces are primarily involved in this interworking process?
Option 1: Gn and S3 interfaces
Option 2: Gi or SGi reference point and the Gp or S8 interface
Option 3: Iu and S12 interfaces
Option 4: Sh and S6d interfaces
Explanation: Network interworking between a packet domain PLMN and another network for service execution involves specific reference points and interfaces. The correct answer is accurate because Gi/SGi facilitates interaction with external IP networks for data packet exchange, while Gp/S8 enables roaming between different PLMNs for seamless data transfer across network boundaries.