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Answer: Obtain Reserved Instances for steady usage and handle seasonal increases with On-Demand pricing.
The correct answer is C. The application requires a solution that does not allow for any interruptions, which rules out the use of Spot Instances (Option B) as they can be terminated by AWS with a two-minute warning during periods of high demand. Option A, while providing a reserved instance, does not address the seasonal spikes specifically. Option D is not cost-effective as it reserves capacity for the peak usage all year round, which is unnecessary for short-term seasonal increases. Option C is the most cost-effective as it ensures the base load is covered by Reserved Instances, which are cheaper than On-Demand pricing, and allows the seasonal spikes to be handled by On-Demand Instances, which, despite being more expensive, do not require over-provisioning for the entire year and do not risk service interruption.
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Which AWS purchasing strategy is most cost-effective for an unmodifiable application running on EC2 and RDS, with predictable usage and temporary seasonal spikes, that cannot tolerate interruptions?
A
Purchase Partial Upfront Reserved Instances from the AWS Marketplace to accommodate both regular and seasonal demands.
B
Acquire Reserved Instances for regular usage and utilize Spot Instances for seasonal surges.
C
Obtain Reserved Instances for steady usage and handle seasonal increases with On-Demand pricing.
D
Procure Reserved Instances to encompass both regular and peak seasonal usage levels.
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