Question: In a CAMEL Phase 4 environment, what is the primary purpose of the Interface between the HLR and the gsmSCF?
Option 1: To facilitate SMS message routing based on subscriber preferences.
Option 2: To enable charging data exchange for voice calls.
Option 3: To provide requested subscriber location and/or state information.
Option 4: To manage handset software updates over the air.
Explanation: This interface's primary purpose is to provide requested subscriber location and/or state information, reflecting its significance in location-based services and subscriber state management within the network.