Question: What is a mandatory condition for the presence of the EFACL (Access Point Name Control List) file in a USIM, in relation to services?
Option 1: Service n° 36 is 'available'
Option 2: Service n° 35 is 'available'
Option 3: Both Service n° 35 and Service n° 36 are 'available'
Option 4: Neither Service n° 35 nor Service n° 36 being 'available' affects its presence
Explanation: According to the specifications, if service n° 35 is 'available', the EFACL (Access Point Name Control List) file shall be present in the USIM. This indicates a direct dependency between the availability of Service n° 35 and the mandatory presence of the EFACL file.