Which actions should be taken in a load balanced cluster in order to protect the load balancer against outages?

Which actions should be taken in a load balanced cluster in order to protect the load balancer against outages?
A . Load balancers cannot be protected against outages which is why they should always be built on dedicated hardware.
B . No actions are necessary as a load balancer cannot become a single point of failure.
C . Two or more load balancers should be deployed as a cascade that passes packets from one to the other.
D . Two load balancers should be deployed as a failover cluster.
E . Load balancers are used for performance and scalability reasons only and cannot be used to archive high availability clusters.

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Answer: D