Question: What is the primary purpose of a terminal identity scheme in a telecom network, as per service principles?
Option 1: To facilitate seamless handovers between different serving networks.
Option 2: To enable billing and charging for data services based on usage.
Option 3: To uniquely identify each terminal for both the home environment and serving network.
Option 4: To enhance security by encrypting communication between the terminal and the network.
Explanation: The correct answer, Option 3, highlights the fundamental requirement for a terminal identity scheme in telecom networks: to ensure each terminal can be uniquely identified. This is crucial for authentication, authorization, and overall network management, impacting how home environments and serving networks interact with terminals. Options 1, 2, and 4, while important aspects of telecom operations, do not directly relate to the primary purpose of a terminal identity scheme as outlined in the service principles context.