When designing solutions that scale elastically, which of the following practices is most effective for both performance and cost efficiency?

When designing solutions that scale elastically, which of the following practices is most effective for both performance and cost efficiency?
A . Always use the maximum available compute capacity for each instance
B . Implement auto-scaling based on real-time demand
C . Deploy services exclusively in a single geographic location to reduce complexity
D . Use reserved instances for all workloads to reduce costs

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Answer: B