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A company runs a web application on Amazon EC2 instances. The application has consistent usage and is expected to run indefinitely. Which EC2 instance purchasing option will meet these requirements MOST cost-effectively?
A
1-year All Upfront Reserved Instances
B
1-year No Upfront Reserved Instances
C
3-year All Upfront Reserved Instances
D
3-year No Upfront Reserved Instances
Explanation:
For applications with consistent usage that are expected to run indefinitely, 3-year All Upfront Reserved Instances provide the most cost-effective option because:
Longer commitment = higher discount: AWS provides the highest discounts for longer-term commitments (3-year vs 1-year)
All Upfront = maximum savings: Paying the entire amount upfront results in the lowest effective hourly rate compared to partial or no upfront options
Consistent usage pattern: Reserved Instances are designed specifically for predictable, steady-state workloads
Indefinite operation: The 3-year term aligns well with long-term operational needs, maximizing cost savings over time
While 3-year No Upfront Reserved Instances offer flexibility, they provide lower discounts than All Upfront options. For truly indefinite operations, the 3-year All Upfront option delivers the best overall value.