Question: Where is the LCS (Location Services) permanent data for each registered UE (User Equipment) subscriber typically stored, in addition to the HLR (Home Location Register)/HSS (Home Subscriber Server), and how is it updated in this additional storage location?
Option 1: Only in the MME (Mobility Management Entity), updated during initial attach procedure.
Option 2: In the VLR (Visitor Location Register)/SGSN (Serving GPRS Support Node), updated manually by the operator.
Option 3: In the VLR/SGSN, downloaded as part of the location update procedure between the VLR/SGSN and HLR/HSS for a UE subscriber.
Option 4: Exclusively in eNodeBs (evolved Node B), synchronized with HLR/HSS during every handover.
Explanation: This is correct because the VLR/SGSN stores the same LCS permanent data as the HLR/HSS for each registered UE subscriber, updated through the location update procedure with the HLR/HSS for consistency across these network elements.