Answer: Partial Upfront costs Reserved

## Explanation For a database server that needs to run for a minimum of one year, **Partial Upfront Reserved Instances** provide the best cost optimization. ### Cost Comparison: - **Spot Instances**: Cheapest option but can be terminated at any time - not suitable for databases that require continuous availability - **On-Demand**: Most expensive option with no long-term commitment - **No Upfront Reserved**: Lower hourly rate than On-Demand but higher than Partial Upfront - **Partial Upfront Reserved**: Provides the best discount among reserved instances options for one-year commitments ### Why Partial Upfront is Best: - **Higher discount**: AWS offers better pricing for partial upfront payments compared to no upfront - **Predictable costs**: Fixed hourly rate for the entire term - **Suitable for long-term workloads**: Perfect for databases that run continuously for extended periods For workloads with predictable usage patterns lasting one year or more, Reserved Instances with partial upfront payment offer the most cost-effective solution while ensuring resource availability.

Author: Ritesh Yadav