Question: What happens to user-related security codes (e.g., PIN, Unblock PIN) stored in the Mobile Equipment (ME) after completion of a procedure involving such a code?
Option 1: They are retained for a specified period for potential future use.
Option 2: They are transferred to the UICC for secure storage.
Option 3: They shall be discarded by the ME immediately after completion of the procedure.
Option 4: They are encrypted and stored in the ME's temporary memory.
Explanation: This is a direct application of security best practices in telecom networks, emphasizing the importance of minimizing the exposure of sensitive information. Immediately discarding user-related security codes after use ensures that even if the ME is compromised, these sensitive codes cannot be retrieved, thereby protecting user security and privacy.