Question: Where is the SCEF-Realm, used to identify the realm of the Service Capability Exposure Function (SCEF), permanently stored, conditional upon specific criteria?
Option 1: Only in the Home Subscriber Server (HSS)
Option 2: Exclusively within the SCEF itself
Option 3: Conditionally across the SCEF, HSS, Mobility Management Entity (MME), and Serving GPRS Support Node (SGSN)
Option 4: Solely in the MME for mobility management purposes
Explanation: The correct storage locations for SCEF-Realm include multiple network elements to ensure accessibility and functionality across different domains. This distributed storage facilitates seamless integration with various network nodes responsible for subscriber data management, mobility, and service exposure.