Question: In the context of IMS (IP Multimedia Subsystem), what is the primary purpose of the 'Nimsas_MediaControl_MediaInstruction' service operation when a specific media flow needs to be terminated or originated in an MF (Media Function) media resource?
Option 1: To update the session ID for all ongoing IMS sessions.
Option 2: To provide instructions for resource reservation in non-media resources.
Option 3: To request additional media specification information for voice calls only.
Option 4: To provide a complete MF media specification for terminating or originating a specific media flow, including details like media ID, media resource capability, and media instruction.
Explanation: The 'Nimsas_MediaControl_MediaInstruction' service operation is designed to handle detailed control over media flows, including termination or origination in MF media resources. This requires a comprehensive set of instructions, encapsulated in a complete MF media specification, to ensure proper handling of the media flow according to the consumer's policies and the capabilities of the media resource.