Explanation

For applications with consistent usage that are expected to run indefinitely, 3-year All Upfront Reserved Instances provide the most cost-effective option because:

• Longer commitment = Higher discount: 3-year Reserved Instances offer greater discounts compared to 1-year options
• All Upfront payment = Maximum savings: Paying the entire amount upfront provides the highest discount rate among Reserved Instance payment options
• Indefinite operation: Since the application will run continuously, committing to a longer term ensures consistent cost savings over time

Cost Comparison:

• 3-year All Upfront: Highest discount (up to 72% off on-demand pricing)
• 3-year No Upfront: Lower discount than All Upfront
• 1-year All Upfront: Good discount but less than 3-year options
• 1-year No Upfront: Lowest discount among Reserved Instances

Key Points:

• Reserved Instances are ideal for predictable, steady-state workloads
• The longer the commitment and more upfront payment, the greater the savings
• For indefinite operations, longer terms provide better long-term cost optimization