The correct answer for the question is B. Reserved instances.
Reserved Instances provide the most cost-effective option for long-term workload needs on EC2 instances, such as a stable production workload that will run for a year. With Reserved Instances, customers can make a one-time upfront payment to receive a significant discount on the hourly usage rate for the instance type they choose. This option is ideal for workloads that are expected to run for an extended period, such as a year or longer.
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