Which option requires the fewest components to implement a fault-tolerant, load-balanced solution for end-user access at each datacenter?

Which option requires the fewest components to implement a fault-tolerant, load-balanced solution for end-user access at each datacenter?
A . Two StoreFront servers in a single StoreFront server group.
B . Two NetScalers in a high availability pair, with load balancing pointing to a single StoreFront server.
C . Three NetScalers in a cluster, with load balancing pointing to two StoreFront servers belonging to the same StoreFront server group.
D . Two NetScalers in a high availability pair, with load balancing pointing to two StoreFront servers belonging to the same StoreFront server group.

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Answer: B