Question: What is the primary purpose of the AAA-1 reference point between the SIP database and the SIP core, as defined in the context of Service Enabler Architecture Layer for Verticals (SEAL)?
Option 1: To retrieve signalling plane data from the SIP database by the SIP core.
Option 2: To manage user authentication for vertical services across different PLMN operators.
Option 3: To facilitate direct communication between the registrar finder and the VAL service provider's network.
Option 4: To synchronize SIP core configurations across multiple network deployments.
Explanation: The AAA-1 reference point is utilized specifically for the SIP core to access and retrieve signalling plane data stored in the SIP database. This functionality is crucial for efficient session management and signalling processes within the SEAL architecture, highlighting the importance of data retrieval in supporting core network operations.