Question: In EPS or 5GS, which entity sends the LCS-PeriodicTriggeredInvokeRes message to the network, and what is the primary purpose of this message?
Option 1: Network to MS (User Equipment), for initiating location services
Option 2: MS (Mobile Station) to Network, for responding to periodic and triggered location requests
Option 3: Network to MS (User Equipment), for reporting area event updates
Option 4: MS (Mobile Station) to Network, for requesting periodic location updates
Explanation: The LCS-PeriodicTriggeredInvokeRes message is sent by the Mobile Station (MS) to the network in response to periodic and triggered location requests in EPS or 5GS networks. This message is a response, not an initiation or request, aligning with the role of MS in responding to network queries for its location.