Question: What is the primary factor used to split the 'PDP Context set-up time, initiated by Network (Mean)' measurement into subcounters?
Option 1: Type of Mobile Equipment (UE)
Option 2: Service Class definitions
Option 3: Geographical Location of the SGSN
Option 4: Traffic Class per Access Point Name (APN)
Explanation: The correct answer is Option 4 because the measurement is split into subcounters based on 'traffic class per APN' (Access Point Name), highlighting the importance of both traffic classification and specific APNs in managing network performance for packet-switched traffic. This approach allows for more granular performance monitoring tailored to different types of network usage and access configurations.