Which control plane component of the multi-controller must be built to meet the requirements?

An architect designs a multi-controller network architecture with these requirements:

✑ Achieve fast failover to control traffic when controllers fail.

✑ Yield a short distance and high resiliency in the connection between the switches and the controller.

✑ Reduce connectivity loss and enable smart recovery to improve the SDN survivability.

✑ Improve connectivity by adding path diversity and capacity awareness for controllers.

Which control plane component of the multi-controller must be built to meet the requirements?
A . control node reliability
B. controller stale consistency
C. control path reliability
D. controller clustering

Answer: B