Question: In the context of SIM applet management, what is a potential purpose of initializing a hierarchy of keys by the card issuer during card personalization, particularly in relation to secure operational updates?
Option 1: To facilitate secure over-the-air (OTA) updates of the SIM's operating system
Option 2: To enable authentication and encryption for communications between the applet and remote servers
Option 3: To restrict access to specific applets based on subscriber identity
Option 4: To enhance the SIM's storage capacity for additional applets
Explanation: Initializing a hierarchy of keys during card personalization sets the foundation for secure interactions. This security measure is crucial for protecting sensitive operations, including potentially, the secure updating of the SIM's operating system over-the-air (OTA), which requires authenticated and encrypted communications to prevent tampering or unauthorized access.