Question: What is the primary factor that determines the split of 'DP Context set-up time, initiated by Network (Max)' measurement into subcounters in a Core Network (CN) Packet Switched (PS) domain?
Option 1: Type of User Equipment (UE)
Option 2: Service Class definitions
Option 3: Traffic Class and Access Point Name (APN)
Option 4: Location of the Serving GPRS Support Node (SGSN)
Explanation: The correct answer is Option 3 because the 'DP Context set-up time, initiated by Network (Max)' measurement is split into subcounters per traffic class and per Access Point Name (APN), highlighting the importance of these two factors in differentiating setup times for PDP contexts initiated by the network, allowing for granular analysis and optimization based on traffic type and APN used.