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AWS Certified Solutions Architect - Professional · AWS
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
Going with D cuz, 1. Computing Saving Plan is cover both EC2 and Fargate 2. Manually scaling the RDS is for predicable workload and cost saving that purchase RI for the RDS
Option B is by far the worst answer.. I'm a little worried that so many people have voted for it. Why would you purchase a savings plan for compute baselined at "medium" load? That entirely defeats the purpose of scalable resources. You are overpaying when the load is baselining and you are scaling up anyway when the load peaks... Secondly, it says scale "Read Replicas," which gets you nothing at all if the increased load is write intensive. Using some common sense, we can deduce that an application that sells tickets to events is going to be highly transactional and likely need to scale writes along with reads.
While B is safer operationally due to ODCR, it’s not the most cost-effective because ODCR charges at On-Demand rates. On the AWS exam, “most cost-effective” + “infrequent peaks” usually means Compute Savings Plans for the baseline (covers EC2 + Fargate) and Spot Instances for peaks. That’s why D is correct: it maximizes discounts, uses the cheapest scaling option, and avoids over-provisioning the database year-round.