Question: In a 3GPP Northbound API framework, what is a key capability of the Common API Framework (CAPIF) regarding User Equipment (UE: User Equipment) interaction?
Option 1: The CAPIF only supports UE acting as an API provider for network-initiated services.
Option 2: The CAPIF shall support applications on the UE acting as an API invoker, initiating service requests.
Option 3: The CAPIF is exclusively designed for UE to manage its own resource exposure without external API invocation.
Option 4: The primary role of CAPIF on UE is to handle billing for API usage, not direct API invocation or provision.
Explanation: This correct answer highlights the CAPIF's flexibility in supporting UE-initiated interactions. By allowing the UE to act as an API invoker, the CAPIF enables a broader range of use cases where the user's device can proactively request services or resources from the network or other API providers, enhancing overall service accessibility and user experience in telecom networks.