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Which technology enables operators 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 operators 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. Openstack
C. Operations support systems
D. Software Defined Networ
E. Business support systems
Correct Answer: A