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Which combination MAXIMISES savings on a stable 24×7 workload running 200 EC2 instances over the next 3 years?
AReserved Instances for every Region just in case
BBuying the largest EC2 instance type and ignoring usage
CA 3-year Compute Savings Plan (or Standard RIs) covering the steady baseline at the lowest hourly commitment
DRunning everything on Spot 24×7
Answer & Solution
Correct answer: C. A 3-year Compute Savings Plan (or Standard RIs) covering the steady baseline at the lowest hourly commitment
3-year all-upfront Compute Savings Plans or Standard RIs deliver the deepest discounts (~60-72% off) for steady workloads. Spot is interruption-prone. Over-buying RIs across regions wastes commitment. Over-provisioning hurts cost.
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