Question: What is a crucial aspect of manufacturer-controlled ME personalization/de-personalization processes, especially when handling critical data like IMSI and associated control keys?
Option 1: Utilizing open-source software for simplicity
Option 2: Implementing a trial-and-error approach for security
Option 3: Following secure arrangements with key or password control
Option 4: Relying solely on physical device storage for sensitive data
Explanation: Secure handling of critical data such as IMSI (International Mobile Subscriber Identity) and associated control keys is paramount to prevent unauthorized access. Manufacturer-controlled processes for ME personalization/de-personalization must, therefore, adhere to stringent security protocols, which include key or password control to safeguard sensitive information, reflecting best practices in telecom security for protecting user and device identities.