Question: What is a mandatory outcome after a successful PIN change on a Mobile Equipment (ME) as per conformance requirements?
Option 1: Both the old and new PINs are accepted for further PIN verification.
Option 2: The ME reverts to its default PIN after a successful change.
Option 3: No indication of the PIN change is presented to the user.
Option 4: Only the new PIN is accepted for further PIN verification, with an indication of the successful change presented to the user.
Explanation: After a successful PIN change, the ME must indicate this change to the user and only accept the new PIN for subsequent verifications, ensuring security and confirming the update of access credentials.