Question: What determines the presence of the EFMMDF (Multimedia Messages Data File) in a USIM application, according to 3GPP specifications?
Option 1: Availability of service n°67
Option 2: Presence of DFMULTIMEDIA directory
Option 3: Support for BER-TLV encoding
Option 4: Implementation of MMS (Multimedia Messaging Service)
Explanation: The presence of the EFMMDF is conditional upon a specific service being available, namely service n°67. If this service is marked as 'available', then the EFMMDF must be present in the USIM application, indicating its role in storing multimedia message data for this particular service.