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AWS Certified Solutions Architect - Professional · AWS
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B is correct, because it satisfies all constraints—especially no long-term commitments + cost efficiency—while the others do not.
A -Since most cost effective
I’d go with A instead of D. Scheduled jobs make up most of the workload (65%) and have strict SLAs, so they need guaranteed capacity. Option A does this with On-Demand instances + Capacity Reservations The remaining instances, which handle user jobs that aren’t time-sensitive, run on Spot instances. This keeps costs low without risking SLA violations. Option D might seem safe because it spreads more On-Demand instances across three AZs, but that’s actually overkill. You end up paying more for extra guaranteed capacity than needed, and it doesn’t meaningfully improve availability with two AZs, like in A, are already enough to survive an AZ failure. Spot instances in D are also fewer, so you don’t save as much.