Question: In a VLR supporting MT roaming retry, what triggers the update of the 'Cancel Location received' parameter for an IMSI record?
Option 1: Receipt of an incoming call from the UE
Option 2: Periodic location update from the UE
Option 3: Reception of a Cancel Location message from the HLR
Option 4: Handover request from a neighboring cell
Explanation: The 'Cancel Location received' parameter is specifically updated in response to receiving a Cancel Location message from the Home Location Register (HLR). This update is crucial for determining whether to trigger Mobile Terminated (MT) roaming retry upon receipt of an incoming call, highlighting the interaction between location management and call handling in telecom networks.