The company frequently does not use all of its Amazon EC2 capacity for stateless workloads and wants to reduce EC2 costs. Which EC2 purchasing option is most appropriate?

Spot Instances are the most cost-effective option for stateless, fault-tolerant workloads because they allow you to bid on unused EC2 capacity, offering significant discounts compared to On-Demand prices. Since the workloads are stateless, they can be interrupted and restarted without data loss, making them ideal for Spot Instances. Dedicated Instances provide physical isolation and are much more expensive, not reducing costs. Reserved Instances offer discounts for committing to a specific instance type and region for a 1-3 year term, but they are less flexible and not as cost-effective for frequently unused capacity as Spot Instances. On-Demand Instances are the most expensive option and offer no cost savings for unused capacity.