Answer: AWS Cost Explorer, AWS Compute Optimizer

AWS Cost Explorer and AWS Compute Optimizer are the two services that can identify rightsizing opportunities for Amazon EC2 instances: - **AWS Cost Explorer**: Helps analyze costs and usage patterns, allowing you to identify underutilized EC2 instances that could be rightsized to save costs. - **AWS Compute Optimizer**: Specifically designed to recommend optimal AWS resources for your workloads, including EC2 instance types, based on utilization metrics. The other options are not designed for rightsizing: - **AWS Billing Conductor**: Manages billing and cost allocation, not rightsizing recommendations - **Amazon CodeGuru**: Focuses on code quality and performance optimization for applications - **Amazon SageMaker**: A machine learning service, not related to infrastructure rightsizing

Author: Ritesh Yadav