Which AWS service or feature should the company use to rightsize the EC2 instances?

Explanations:

AWS Config is primarily used for resource inventory, configuration history, and compliance auditing. It does not provide recommendations for rightsizing EC2 instances based on usage metrics.

AWS Cost Anomaly Detection helps identify unusual spending patterns in AWS accounts but does not analyze instance utilization or provide rightsizing recommendations.

AWS Budgets allows users to set custom cost and usage budgets, alerting them when their usage exceeds specified thresholds. However, it does not provide rightsizing recommendations for EC2 instances.

AWS Compute Optimizer analyzes the utilization of EC2 instances and provides recommendations for optimal instance types based on usage patterns, making it the correct choice for rightsizing EC2 instances.