AWS Certified Cloud Practitioner (CLF-C02) — Question 629

A company has a workload that will run continuously for 1 year. The workload cannot tolerate service interruptions.

Which Amazon EC2 purchasing option will be MOST cost-effective?

Answer options

• A. All Upfront Reserved Instances
• B. Partial Upfront Reserved Instances
• C. Dedicated Instances
• D. On-Demand Instances

Correct answer: A

Explanation

Reserved Instances (RIs) provide a significant discount compared to On-Demand pricing for steady-state workloads, with the All Upfront payment option offering the highest savings rate. Partial Upfront RIs provide a slightly lower discount than All Upfront RIs, while On-Demand and Dedicated Instances are much more expensive options that are not cost-optimized for predictable, long-term workloads.