Question: In a USIM supporting Multimedia Message Storage, what action is taken by the Mobile Equipment (ME) if there is no available empty space in the EFMMDF file to store a new Multimedia Message?
Option 1: The ME automatically deletes the oldest Multimedia Message in EFMMDF to make space.
Option 2: The ME updates the EFMML file to reflect the lack of storage space for new messages.
Option 3: The ME attempts to compress the existing Multimedia Messages in EFMMDF to free up space.
Option 4: The procedure is aborted, and the user is notified about the insufficient storage space.
Explanation: According to procedures for handling Multimedia Message Storage on a USIM, if there's no available empty space in the EFMMDF file, the Mobile Equipment (ME) will abort the storage procedure and notify the user, ensuring data integrity and preventing potential errors.