In a network function virtualization reference architecture, which two statement about virtualized network function are true?(Choose two)

In a network function virtualization reference architecture, which two statement about virtualized network function are true?(Choose two)
A . VNF is the totality of all hardware and software components that build up the NFV environment
B . One VNF can be deployed over multiple VMs, where each VM hosts a single component of the VNF
C . VNF performs the orchestration and lifecycle management of the software resources that supports the virtualized infrastructure
D . VNF is a virtualization of a legacy network function
E . VNF functionality includes control and management of the compute, storage, and network resources in the NFV framework

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Answer: B, D