Question: When does a Visitor Location Register (VLR) include the Global CN-Id information element in a paging request initiated by IMSI via the SGs interface?
Option 1: Always, as part of every paging request for efficient routing.
Option 2: Only when the network supports Intra Domain Connection of RAN Nodes to multiple Core Network (CN) Nodes functionality.
Option 3: Exclusively for roaming subscribers to facilitate inter-network communication.
Option 4: Never, as this information is not pertinent to paging requests via SGs interface.
Explanation: The correct answer, Option 2, highlights a specific condition under which the VLR includes the Global CN-Id. This condition is directly related to the network's support for Intra Domain Connection of RAN Nodes to multiple CN Nodes, indicating that the inclusion of Global CN-Id is contingent upon this functionality. This ensures efficient routing and handling of paging requests in complex network topologies. The other options are incorrect because they either generalize the inclusion too broadly (Option 1), introduce unrelated scenarios (Option 3), or inaccurately state the element's relevance (Option 4).