What is a benefit of running multiple instances of a back-end service and using load balancing to distribute the communication between the front-end and back-end services?

What is a benefit of running multiple instances of a back-end service and using load balancing to distribute the communication between the front-end and back-end services?
A . The consistency of data for stateful services increases.
B. High availability is provided for the back-end services.
C. Scaling horizontally is automated out of the box.
D. The total load on the database servers decreases.

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Answer: B