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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.
