Question: What happens to a service API's discoverability by API invokers after it is unpublished through the Common API Framework (CAPIF)?
Option 1: Its discoverability is limited to only within the PLMN trust domain.
Option 2: It becomes exclusively available for discovery by 3rd party trust domains.
Option 3: Its discoverability remains unchanged for existing API invokers.
Option 4: It is no longer available to be discovered by any API invoker.
Explanation: Unpublishing a service API through CAPIF removes its visibility, making it inaccessible for discovery by all API invokers, regardless of their trust domain. This ensures the API is completely withdrawn from public access, aligning with the expected outcome of an unpublish action in a controlled API framework.