Answer: Security, Cost optimization, Performance optimization

AWS Trusted Advisor provides insights in four main categories: - **Security** - Identifies security gaps and vulnerabilities - **Cost Optimization** - Recommends ways to reduce costs and improve resource utilization - **Performance** - Provides recommendations to improve service performance - **Fault Tolerance** - Helps improve application availability and redundancy The other options (Service limits and Backup and recovery) are not among the four main categories of Trusted Advisor insights.

Author: Ritesh Yadav