What is one trend that puts pressure on existing network infrastructures and drives the need for software-defined networking (SDN)?

What is one trend that puts pressure on existing network infrastructures and drives the need for software-defined networking (SDN)?
A . Companies are implementing private clouds, and network administrators must be able to respond to service requests quickly.
B . Network infrastructures are allocating too much bandwidth to voice, video, and collaboration traffic, starving out other applications.
C . Companies increasingly host fewer functions per hypervisor.
D . Network administrators increasingly provision security to permit only company-owned assets to connect to the network.

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Answer: A