Question: What is the primary condition for a user to obtain services from multiple networks simultaneously in the 5G system?
Option 1: The user must have a subscription with each of the operators.
Option 2: A business agreement is required between the network operators, and the use of multiple serving networks is under the control of the home operator.
Option 3: The user's device (UE) must support multiple network connections.
Option 4: The services offered by different operators must be identical.
Explanation: According to the service requirements for the 5G system, a business agreement between network operators is necessary, and the home operator controls the use of multiple serving networks. This ensures that users can obtain services from more than one network simultaneously on an on-demand basis while maintaining service continuity with minimal interruption when switching between networks operated by different operators.