Question: What is the primary purpose of the HLR-VLR interface in the context of Customised Applications for Mobile network Enhanced Logic (CAMEL)?
Option 1: To manage mobility between different PLMNs for roaming subscribers.
Option 2: To exchange CAMEL-related subscriber data and provide MSRN, as well as retrieve subscriber status and location information.
Option 3: To handle billing and charging for CAMEL services across networks.
Option 4: To facilitate direct communication between User Equipment (UE) and the Home Location Register (HLR).
Explanation: The correct answer accurately reflects the described functions of the HLR-VLR interface in the context of CAMEL, including exchanging subscriber data, providing MSRN, and retrieving subscriber status and location information to support customized services for roaming subscribers.