Which Amazon EC2 purchasing option will be MOST cost-effective?

Explanations:

All Upfront Reserved Instances provide the lowest hourly rate compared to other options. Since the workload runs continuously for a year and cannot tolerate interruptions, this option is the most cost-effective for long-term use.

Partial Upfront Reserved Instances have a higher hourly rate than All Upfront Reserved Instances. Although they require less upfront payment, they are not the most cost-effective option for a continuous workload over a year.

Dedicated Instances are primarily used for compliance and regulatory requirements, providing physical isolation. They have a higher cost compared to Reserved Instances, making them less cost-effective for long-term continuous workloads.

On-Demand Instances offer flexibility and no long-term commitment but have the highest hourly rates compared to Reserved Instances. For a workload running continuously for a year, this option is the least cost-effective.