Question: In a Universal Subscriber Identity Module (USIM) application, what is a condition for the presence of the EFSDN (Service Dialling Numbers) file?
Option 1: If service n° 1 or service n° 2 is 'available'
Option 2: If service n° 4 and/or service n° 89 is 'available'
Option 3: If the UE (User Equipment) is in eCall mode only
Option 4: If the network/bearer capabilities require it, regardless of service numbers
Explanation: The correct answer is based on the condition specified for the EFSDN file's presence, which directly relates to the availability of specific services (n° 4 and/or n° 89), highlighting the importance of service-specific configurations in USIM applications.