Answer: Reserved Instances

## Explanation **Reserved Instances** are the correct choice for this scenario because: - **Long-term commitment**: Reserved Instances provide significant discounts (up to 75%) compared to On-Demand pricing when you commit to a 1-year or 3-year term - **Continuous availability**: For applications that need to run continuously for 3+ years, Reserved Instances guarantee capacity and provide cost savings - **Predictable billing**: Reserved Instances offer predictable pricing for long-term workloads **Why other options are incorrect**: - **Spot Instances**: These offer the lowest prices but can be interrupted with short notice, making them unsuitable for applications requiring continuous availability - **On-Demand Instances**: These provide no discounts and are the most expensive option for long-term usage - **EC2 Fleet**: This is a management feature that allows you to manage capacity across different instance types and purchasing options, not a specific discount pricing model For workloads with predictable usage patterns and long-term requirements, Reserved Instances provide the best cost optimization while ensuring availability.

Author: Ritesh Yadav