D. Spot Instances
https://aws.amazon.com/ec2/spot/
"You can use Spot Instances for various stateless, fault-tolerant, or flexible applications such as big data, containerized workloads, CI/CD, web servers, high-performance computing (HPC), and test & development workloads."
Spot Instances. This is because Spot Instances allow users to bid for unused EC2 instances, often resulting in significantly lower costs compared to On-Demand or Reserved Instances. However, it is important to note that Spot Instances may be terminated if the current spot price exceeds the user's bid or if there is no more available capacity. Therefore, users should have a plan in place to handle potential interruptions.
For a stateless and restartable application that will run on an Amazon EC2 instance for 2 hours at a time, the most cost-effective purchase option would be Spot Instances. Option D is the correct answer.
Spot Instances are spare EC2 instances that are available for less than the On-Demand price. Spot Instances allow you to take advantage of unused EC2 capacity in the AWS cloud, which can be significantly cheaper than On-Demand or Reserved Instances. You can bid on Spot Instances and pay the Spot price, which varies based on supply and demand.
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