Question: What happens to the SIM/USIM personalization indicator in a Mobile Equipment (ME) if the user enters a Personalisation Control Key (PCK) that matches the one stored in the ME during the de-personalisation process?
Option 1: The SIM/USIM personalization indicator is set to 'locked' as an additional security measure.
Option 2: The SIM/USIM personalisation indicator is set to 'off', indicating successful de-personalisation.
Option 3: The SIM/USIM personalisation indicator remains unchanged, requiring further action for de-personalisation.
Option 4: The ME automatically inserts a default PCK to override the entered one for security reasons.
Explanation: According to the de-personalisation process outlined for Mobile Equipment (ME), when the user enters a Personalisation Control Key (PCK) that matches the stored PCK, it directly leads to the SIM/USIM personalisation indicator being set to 'off'. This indicates that the ME has been successfully de-personalised. This process ensures security by verifying the entered PCK against the stored one before proceeding with the de-personalisation.