SAA-C03 Q75 · Cost

Question

A company is migrating its databases to Amazon RDS for PostgreSQL. The company is migrating its applications to Amazon EC2 instances. The company wants to optimize costs for long-running workloads. Which solution will meet this requirement MOST cost-effectively?

Accepted Answer

**Answer D** is the MOST cost-effective because it maximizes discounts on every dimension:

1. **Longest term (3 years)**: Longer commitment = deeper discount. A 3-year term provides significantly more savings than a 1-year term (up to ~60% vs ~30-40% off On-Demand).

2. **All Upfront payment**: Paying everything upfront yields the maximum possible discount. The hierarchy is: All Upfront > Partial Upfront > No Upfront.

3. **RDS Reserved Instances**: For RDS, Reserved Instances are the primary commitment-based discount mechanism. Savings Plans do NOT cover RDS — only Reserved Instances do. So using RDS RIs is the correct and only commitment option for RDS.

4. **EC2 Instance Savings Plan**: Provides flexibility within a specific instance family in a region while still offering significant

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