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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.
