Question: Which entity is identified as a known consumer of the `Subscribe_Location_Monitoring` API operation in the context of Service Enabler Architecture Layer for Verticals (SEAL)?
Option 1: User Equipment (UE)
Option 2: Vertical Application Server (VAL server)
Option 3: Mobility Management Entity (MME)
Option 4: Serving and Packet Data Network Gateway (SGW/PGW)
Explanation: The correct answer is the Vertical Application Server (VAL server) because, according to the provided context, it is explicitly mentioned as a "Known Consumer" of the `Subscribe_Location_Monitoring` API operation. This implies that the VAL server utilizes this operation for its functionalities within the SEAL architecture, likely for location-based services or applications. The other options, while relevant in telecom networks (e.g., UE for end-user devices, MME for mobility management, and SGW/PGW for data network gateways), are not identified as consumers of this specific API operation in the given context.