Question: Upon receiving an SGsAP-RESET-INDICATION from the Mobility Management Entity (MME), what are the possible actions a Visitor Location Register (VLR) can take regarding the 'Confirmed by Radio Contact' restoration indicator for all affected SGs associations?
Option 1: Always set the 'Confirmed by Radio Contact' restoration indicator to 'true' and change the state of all affected SGs associations to SGs-ACTIVE.
Option 2: Either set the 'Confirmed by Radio Contact' restoration indicator to 'false' and reset the state, or keep both unchanged, depending on the VLR's configuration.
Option 3: Immediately send an SGsAP-RESET-ACK without altering the 'Confirmed by Radio Contact' restoration indicator in any of the affected associations.
Option 4: Set the 'Confirmed by Radio Contact' restoration indicator to 'false' and set the state of all affected SGs associations to SGs-NULL, or keep both unchanged to potentially reduce subsequent paging signalling.
Explanation: This reflects the two possible actions a VLR can take in response to an MME's indication of unreliable UE state information: either resetting the indicator and association state for thoroughness or leaving settings unchanged to minimize subsequent paging signalling, thus balancing between thoroughness and efficiency in wireless communication networks.