Question: In a Generic Bootstrapping Architecture (GBA) as per 3GPP specifications, what is a key capability for a subscriber when roaming outside their Home Network?
Option 1: The subscriber can only access network application functions within the visited network.
Option 2: The subscriber can utilize the bootstrapping function of their Home Network while accessing a network application function in the visited network.
Option 3: Roaming subscribers are automatically authorized for all services without Home Network approval.
Option 4: The visited network determines the authorization for the subscriber's service usage outside their Home Network.
Explanation: This option correctly reflects the GBA roaming requirements, allowing a subscriber to utilize their Home Network's bootstrapping function even when located outside of it, while also potentially accessing application functions in the visited network. This setup enables seamless and secure service continuity for subscribers while roaming, under the control and authorization of their Home Network.