AWS Certified Solutions Architect Professional SAP-C02 Practice Question
A financial-services company runs a mission-critical Java application on 200 Amazon EC2 m6i.large instances in an Auto Scaling group that spans three Availability Zones in the us-east-1 Region. The group has maintained a steady baseline of 200 instances for more than a year, although developers occasionally scale individual instances up to m6i.xlarge size.
The finance team must reduce compute costs by at least 60 % for the next 3 years while:
Avoiding any need to manage capacity reservations
Ensuring that the discount applies only to this production workload
Retaining the ability to move between sizes inside the m6i family but not to other instance families
Which purchasing option best meets these requirements?
Purchase 3-year, All-Upfront Convertible Reserved Instances scoped to the Region that cover 200 m6i.large instances.
Purchase 3-year, All-Upfront Standard Reserved Instances scoped to the us-east-1 Region that cover 200 m6i.large instances.
Commit to a 3-year Compute Savings Plan equal to the On-Demand cost of 200 m6i.large instances.
Create 200 On-Demand Capacity Reservations in each Availability Zone and attach them to a 3-year No-Upfront Savings Plan.
3-year All-Upfront Standard Reserved Instances (RIs) scoped to the Region provide the deepest long-term discount-up to 72 % off On-Demand prices-easily exceeding the 60 % savings target. Regional scope means the discount is automatically applied to matching usage in any Availability Zone, so operations teams do not have to manage individual capacity reservations.
Standard RIs also offer Linux size flexibility inside the same instance family; one m6i.large RI can automatically cover half of an m6i.xlarge or four-tenths of an m6i.2xlarge. This satisfies the requirement to move between m6i sizes while ensuring that the discount never extends to workloads running other instance families in the same accounts.
Convertible RIs allow exchanging across families but deliver only up to 54 % savings, so they miss the cost-reduction goal. Compute Savings Plans can provide similar or greater savings (up to 66 %) but apply to all compute usage in the linked accounts; they do not restrict the benefit to the specific production workload, violating the finance team's requirement. On-Demand Capacity Reservations add no price discount at all.
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