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AWS Certified Solutions Architect - Professional · AWS
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For known workload and need to scale during low time, auto scaling is a no brain-er
The most cost-effective solution is B, on-demand capacity, because it automatically scales with traffic, requires no management, and charges only for actual usage, unlike provisioned or reserved capacity which waste money during off-peak hours.
On demand is $$$ provisioned all the time is $$$ but autoscaling works with provisioned to scale write and read when needed