Question: In a Location Services (LCS) scenario, where a Gateway Mobile Location Centre (GMLC) outside the Home Public Land Mobile Network (HPLMN) requests a location estimate, what interface is utilized to facilitate the necessary privacy check in the HPLMN?
Option 1: Lh interface between the GMLC and HLR/HSS
Option 2: Lg/Lgd interface between the GMLC and SGSN/MSC Server/MME
Option 3: Lr interface between GMLCs in different PLMNs
Option 4: Le reference point between the LCS client and GMLC
Explanation: The Lr interface facilitates communication between GMLCs in the same or different PLMNs, enabling authorization and privacy checks for location requests from outside a UE's HPLMN, ensuring the UE's privacy profile settings are checked in its home network before delivering a location estimate.