Answer: AWS Compute Optimizer, AWS Trusted Advisor

## Explanation **AWS Compute Optimizer** analyzes the configuration and resource utilization of your EC2 instances and provides recommendations for optimal instance types and sizes based on historical usage patterns. It helps identify rightsizing opportunities to improve performance and reduce costs. **AWS Trusted Advisor** provides real-time guidance to help provision your resources following AWS best practices. It includes checks for cost optimization, performance, security, and fault tolerance. Trusted Advisor can identify underutilized EC2 instances and recommend appropriate instance types. **Why not the other options:** - **AWS Auto Scaling**: Automatically adjusts capacity to maintain steady performance at the lowest possible cost, but doesn't provide specific recommendations about instance sizing - **AWS Control Tower**: Provides governance and multi-account management, not instance optimization - **AWS X-Ray**: Helps analyze and debug distributed applications, not for instance sizing recommendations

Author: Ritesh Yadav