Question: What is a requirement for all 3GP files in terms of conformance to profiles as per the specified standards?
Option 1: A 3GP file cannot conform to more than one profile.
Option 2: Conforming to a profile is optional for 3GP files.
Option 3: A 3GP file must conform to all defined profiles.
Option 4: A 3GP file must conform to at least one profile and may conform to multiple profiles.
Explanation: This correct answer reflects the nuanced understanding of the profile conformance requirement for 3GP files, highlighting flexibility (allowing conformance to multiple profiles) while ensuring a baseline level of compliance (conforming to at least one profile). This is crucial in telecom networks for maintaining compatibility and interoperability among diverse devices and services.