Question: Under what circumstances shall a Mobile Equipment (ME) delete all Generic Bootstrapping Architecture (GBA) keys, including Ks and NAF-specific keys derived from Ks?
Option 1: When the Universal Integrated Circuit Card (UICC) is removed, another UICC is inserted, or no UICC is present upon power-up.
Option 2: Only when the key lifetime of a specific Ks expires.
Option 3: Whenever a UICC application is terminated without any change in UICC presence.
Option 4: None of the above; GBA keys are deleted based on a schedule set by the network operator.
Explanation: This reflects the conditions for ensuring security and privacy by deleting sensitive keys when there's a change in the UICC, which could indicate a potential security breach. These conditions include removal of the UICC, insertion of a different UICC, or powering up without any UICC present, necessitating GBA key deletion to maintain system integrity.