What are two functions of a Network Services Orchestrator in an NFV environment? (Choose two.)
It operates at the resource-facing services layer and provides overall lifecycle management at the network service level.
It provides an API-based northbound interface for transparent integration with systems that operate at the resource-facing services layer.
It provides a standards-based southbound interface for transparent integration with systems that operate at the customer-facing services layer.
It provides a standards-based northbound interface for transparent integration with systems that operate at the customer-facing services layer.
It operates at the customer-facing services layer and provides the management interface for the virtual network devices.
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