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Answer: Reserved Instances for baseline capacity with Spot Instances for overflow.
The correct answer is C. Using Reserved Instances for baseline capacity ensures a consistent cost for expected demand, while Spot Instances provide a cost-effective way to handle additional, unpredictable traffic. This combination leverages the cost savings of Reserved Instances with the flexibility and lower cost of Spot Instances to manage unexpected traffic spikes, making it the most cost-effective solution for continuous, scalable processing.
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A production application on Amazon EC2 instances reads and processes messages from an Amazon SQS queue. Given unpredictable and intermittent message volumes, which cost-effective solution ensures continuous processing without downtime?
A
Spot Instances for maximum capacity.
B
Reserved Instances for maximum capacity.
C
Reserved Instances for baseline capacity with Spot Instances for overflow.
D
Reserved Instances for baseline capacity with On-Demand Instances for overflow.
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