Question: In a 3GPP packet domain, what is the primary purpose of defining a comprehensive set of Packet Domain-specific commands for User Equipment (UE)?
Option 1: To restrict Multiple Contexts activation to only advanced Mobile Terminals (MT)
Option 2: To provide flexibility and accommodate new PDP types and interface protocols in complex MTs
Option 3: To enforce backwards compatibility with existing circuit-switched services exclusively
Option 4: To limit the use of extended information and error message capabilities to simple MTs
Explanation: The primary purpose is to offer flexibility, especially for complex Mobile Terminals (MTs), allowing support for multiple PDP types, external networks, and QoS profiles, ensuring scalability and future-proofing in packet switched services.