After moving an application to AWS, a company runs it on EC2 instances across several instance families. Performance problems appear on some instances during testing, and strict budget controls require selecting instance types that match workload needs. Which course of action should the SysOps administrator take?

The correct approach is to first optimize instance types and then apply cost savings. AWS Compute Optimizer analyzes historical utilization metrics to recommend optimal EC2 instance types, addressing the performance issues and budget constraints by ensuring instances match workload needs. After rightsizing, Compute Savings Plans provide flexible savings (up to 66%) across EC2, Fargate, and Lambda usage, regardless of instance family, region, or operating system, making them ideal for a diverse and potentially changing EC2 fleet. Buying Reserved Instances (RIs) immediately is premature before rightsizing, as you might commit to suboptimal instance types. Exchanging RIs later can be complex and might incur additional costs or limitations. Zonal RIs are too restrictive given the need for flexibility across instance families. Analyzing the Cost and Usage Report is useful for cost allocation but doesn't directly provide rightsizing recommendations like Compute Optimizer. On-Demand Capacity Reservations guarantee capacity but don't offer cost savings or rightsizing advice.