Which AWS service provides recommendations to help users optimize costs and follow AWS best practices?

Explanations:

AWS Trusted Advisor provides recommendations to help users optimize costs, improve performance, and follow AWS best practices across their AWS resources. It analyzes your usage and provides insights into areas like underutilized resources, cost optimization, and security best practices.

AWS Service Catalog is used to create and manage catalogs of IT services that are approved for use on AWS. It does not provide recommendations for optimizing costs or best practices.

AWS Ground Station is a fully managed service that enables users to control satellite communications and process data from satellite feeds. It is unrelated to cost optimization or best practices recommendations.

Amazon GuardDuty is a threat detection service that continuously monitors for malicious activity and unauthorized behavior to protect AWS accounts and workloads. It does not focus on cost optimization or AWS best practices.