Which technology enables operations to move the functionality of networking devices such as routers and firewalls away from proprietary hardware to servers and off-the-shelf commercially available purpose-built hardware?

Which technology enables operations to move the functionality of networking devices such as routers and firewalls away from proprietary hardware to servers and off-the-shelf commercially available purpose-built hardware?
A . Network Function Virtualization
B . Business support systems
C . Software Defined Networking
D . Operations support systems
E . OpenStack

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Answer: A