Question: In the INTERROGATION state of Location Services (LCS) as per 3GPP standards, what is the GMLC awaiting from the home HLR/HSS in response to its interrogation for a UE to be located?
Option 1: Only the IMSI of the UE
Option 2: One or more of the following: VMSC, MSC Server, SGSN address, MME address, and IMSI for the UE
Option 3: The current Cell ID and Location Area Code (LAC) of the UE
Option 4: Confirmation of the UE's active services and billing status
Explanation: In the INTERROGATION state, the GMLC has initiated a query to the home HLR/HSS for a UE that needs to be located. The response anticipated includes one or several key pieces of information: VMSC, MSC Server, SGSN, MME addresses, and the IMSI of the UE. These details are crucial for further location service processing, identifying the current serving network elements associated with the UE, facilitating the determination of its location.