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Answer: Reserved Instances for production; On-Demand Instances for development and test.
The correct answer is B. Reserved Instances provide a significant discount compared to On-Demand Instances when instances are used continuously, making them a cost-effective option for production environments that run 24/7. For development and test environments that do not run continuously, On-Demand Instances are a smart choice due to their flexibility and no upfront commitment. Spot Instances or Spot blocks are not ideal for production where reliability is critical due to their potential for interruptions, and while they can save costs, they are less suitable for predictable development and test workloads compared to the flexibility offered by On-Demand Instances.
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A company seeks to minimize costs in its three-tier web architecture using Amazon EC2 for development, test, and production environments. With varying CPU utilization and different operational hours for each environment, which purchasing solution is most cost-effective for EC2 instances, considering the company's plan to automate the stopping of development and test instances when idle?
A
Spot Instances for production; Reserved Instances for development and test.
B
Reserved Instances for production; On-Demand Instances for development and test.
C
Spot blocks for production; Reserved Instances for development and test.
D
On-Demand Instances for production; Spot blocks for development and test.