Question: In a UICC-terminal interaction scenario, what is the primary objective of testing with specific key references ("01" to "08") for PIN, as part of verifying PIN unblocking procedures and MMI string support?
Option 1: To ensure compatibility with older ME (Mobile Equipment) models that only support up to 2-digit PINs.
Option 2: To verify the ME's ability to handle PIN inputs from external, non-standard keypad devices.
Option 3: To test the UICC's encryption capabilities for securing PIN data transmission.
Option 4: To confirm the ME supports a standardized range of key references for PIN management as specified in telecom standards.
Explanation: This question requires understanding of telecom testing standards, particularly those related to UICC-terminal interactions. The correct answer highlights the importance of adhering to standardized key reference ranges ("01" to "08") for PIN management, ensuring interoperability and compliance with telecom specifications. This is crucial for seamless operation across different devices and networks.