Question: What is a required security feature in the 5G system for a UE (User Equipment) reported as stolen, subject to regional or national regulatory requirements?
Option 1: Automatic deletion of all stored data on the UE
Option 2: Mandatory handover to a specific network for further investigation
Option 3: Immediate blocking of all incoming calls and messages
Option 4: Secure mechanism for an authorized entity to disable the UE from normal operation, with the possibility of re-enabling upon recovery
Explanation: This option aligns with the specified requirement that the 5G system must support a secure mechanism for disabling a stolen UE's normal operation (to prevent unauthorized use) and also allow for its re-enablement once recovered, all under the control of an authorized entity. This ensures both security against fraudulent use and flexibility for legitimate recovery scenarios, subject to regulatory compliance.