Question: In PS Domain Charging, how is categorization of service data flows and detected applications traffic primarily achieved?
Option 1: By Service-Based Charging Schemes
Option 2: By Rating Groups Only
Option 3: Through a Combination of QoS Class Identifiers and Access Point Names (APNs)
Option 4: Using Dedicated Bearer Establishment Procedures
Explanation: According to the principles outlined for PS domain charging, categorization of both service data flows and detected applications traffic is specifically achieved through the utilization of rating groups. This approach streamlines the charging process by grouping similar services or applications for unified billing purposes, highlighting the importance of rating groups in managing diverse traffic types within telecom networks.