Question: What is required for a UE to use localized services via a hosting network with a certain time and location validity?
Option 1: The UE must have a subscription to the hosting network.
Option 2: The UE must be authenticated by the home network before accessing the hosting network.
Option 3: The UE can use credentials provided by the hosting network, with or without coordination with the home network.
Option 4: The UE must be authorized by a trusted third-party service provider.
Explanation: According to the requirements for the 5G system, a UE can use localized services via a hosting network with a certain time and location validity using credentials provided by the hosting network, either with or without coordination with the home network. This allows for more flexibility in accessing localized services while roaming on a hosting network.