Question: In a 3GPP Northbound API framework, which of the following service-based interfaces is NOT directly associated with the core functionality of the Common API Framework (CAPIF)?
Option 1: Cccf - Service-based interface for Core Network Functions
Option 2: Caef - Service-based interface for API exposing function
Option 3: Nssf - Service-based interface for Network Slice Selection Function
Option 4: Upcf - Service-based interface for Unified Data Repository
Explanation: The correct answer is Option 3 (Nssf) because NSSF, while part of the 5G core network architecture, is not directly associated with CAPIF's core functionality. Its primary role in Network Slicing distinguishes it from interfaces like Cccf and Caef, which are more closely tied to CAPIF's core operations.