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A business invests in SDN and develops its own SDN controller that, due to budget...

A business invests in SDN and develops its own SDN controller that, due to budget constraints, runs on a single controller. The controller actively places an exclusive lock on the configuration of the devices to ensure it is the only source of changes to the environment. What is the result if the controller fails?

A.

All device configurations are in read-only mode until the controller is restored.

B.

The control plane is unavailable until the controller is restored.

C.

If a device fails, the configuration backup is unavailable.

D.

Manual changes are only possible until the controller is restored.

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