What is a key advantage of software-defined networking (SDN) as compared to traditional networking?

What is a key advantage of software-defined networking (SDN) as compared to traditional networking?
A . SDN promotes interoperability through open standards such as OpenFlow but supports vendor specific features as needed.
B . With SDN, network management is simplified because all pure OpenFlow switches can be managed through a single pane-of-glass management console
C . SDN allows companies to deploy software-only switches and routers, which can be managed from a centralized console.
D . With SDN, a network can be influenced by external applications to enable it to change as the applications require.

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Answer: B