Answer-first summary for fast verification
Answer: Reserved Instances for frontend; Spot Instances for backend.
The most cost-effective solution given the requirements is to use Reserved Instances for the frontend nodes and Spot Instances for the backend nodes. Reserved Instances are ideal for the frontend nodes because they run 24/7, providing a significant cost saving over on-demand pricing. Spot Instances are appropriate for the backend nodes, which need to scale based on workload; Spot Instances can be launched at a lower cost and terminated when not needed, offering considerable savings.
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A company operates a custom application on EC2 with constant frontend node operation and variable backend node demand. Which EC2 instance strategy is most cost-effective for scaling?
A
Reserved Instances for frontend; AWS Fargate for backend.
B
Reserved Instances for frontend; Spot Instances for backend.
C
Spot Instances for frontend; Reserved Instances for backend.
D
Spot Instances for frontend; AWS Fargate for backend.
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