Question: Which interface is used for CAMEL access to Location Services (LCS) in 3GPP networks, specifically from CAMEL Phase 3 onwards?
Option 1: Sh interface - Used for IMS (IP Multimedia Subsystem) related services
Option 2: Lh interface - Primarily used for Inter-PLMN (Public Land Mobile Network) handover support
Option 3: Lc interface - Supports CAMEL access to Location Services (LCS)
Option 4: Le interface - Utilized for external UMTS/SMS interworking
Explanation: The Lc interface is designated to support CAMEL access to LCS in 3GPP networks from CAMEL Phase 3 onwards, integrating location-based services with customized mobile network logic.