A company runs a constant EC2 baseline all year and wants to reduce cost without changing workload architecture. Usage is well understood, but instance families may change. Which approach should be evaluated?

1. Commit to the highest historical peak for every hour of the term.
2. Evaluate a suitable Savings Plan against the measured stable hourly usage and flexibility requirements.
3. Move every critical instance to Spot without evaluating interruption tolerance.
4. Assume all unused commitments can always be refunded without restriction.