Question: What is the primary purpose of storing a time stamp along with a location estimate for a target UE (User Equipment) subscriber in entities like VMSC, MSC Server, SGSN, or H-GMLC?
Option 1: To enhance location accuracy for future calculations
Option 2: For billing purposes based on location-based services usage
Option 3: To track the movement history of the UE for security reasons
Option 4: To indicate the 'age' of the location estimate, reflecting how current the information is
Explanation: The time stamp is crucial for indicating the freshness or 'age' of the location estimate. This is vital in Location Services (LCS) as it helps determine how reliable or up-to-date the stored location information is, especially when deciding whether to use a previously obtained location estimate. This directly impacts the accuracy and effectiveness of location-based services.