Question: What is the recommended display duration for each entered digit when a User Equipment (UE) user inputs their PIN or PIN2 after IC card insertion or UE startup?
Option 1: Up to 1 second, to maintain security while allowing brief visual confirmation.
Option 2: Exactly 5 seconds, to ensure the user confirms each digit without rushing.
Option 3: Until the next digit is entered, to provide a clear view of the current entry.
Option 4: The entire PIN/PIN2 entry process, for complete transparency.
Explanation: Displaying each entered digit for up to 1 second strikes a balance between security (not leaving sensitive info visible for too long) and usability (allowing the user to briefly confirm their input). This approach aligns with common practices in secure entry interfaces, minimizing the risk of unauthorized observation while maintaining user convenience.