What is the function of an NFV Orchestrator?
A. It coordinates the life cycle of VNFs that jointly instantiate a network service.
B. It manages the infrastructure.
C. It manages the NFV I compute, storage, and network resources in the cloud data center,
D. It is responsible for service life-cycle management, including instantiating, scaling, upgrading, downgrading, modifying, and terminating VNFs.
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