A workload will run continuously for one year and cannot tolerate interruptions. Which Amazon EC2 purchasing option is the MOST cost-effective for this scenario?

All Upfront Reserved Instances offer the deepest discount for a continuous, one-year commitment, making them the most cost-effective for a workload that cannot tolerate interruptions. Partial Upfront Reserved Instances also provide savings but less than the all upfront option. Dedicated Instances are for specific compliance needs and are significantly more expensive, not primarily for cost savings. On-Demand Instances are the most flexible but also the most expensive for a continuous, long-term workload, as they offer no commitment discounts.