Question: In a 5G system, what is a prerequisite for collecting charging information when a DualSteer device's user data is switched across two 3GPP access networks belonging to different network types?
Option 1: The device must support simultaneous transmission over both networks.
Option 2: A valid subscription to at least one of the networks is required.
Option 3: The networks must be of the same type (e.g., both PLMNs or both NPNs).
Option 4: A proper business/roaming agreement among the network operators is assumed.
Explanation: For a DualSteer device switching user data across two different types of 3GPP access networks (e.g., from a Public Land Mobile Network (PLMN) to a Non-Public Network (NPN)), having a proper business or roaming agreement in place between the network operators is crucial. This agreement facilitates the collection of charging information, ensuring that billing and revenue sharing are accurately managed across different network domains. This highlights the importance of inter-operator agreements for seamless service delivery and financial reconciliation in complex network scenarios.