Answer: AWS Inspector

AWS Inspector is the correct service for analyzing EC2 instances against pre-defined security templates to check for vulnerabilities. **Key Points:** - **AWS Inspector** automatically assesses applications for vulnerabilities or deviations from best practices - It uses pre-defined security templates and rules packages to evaluate EC2 instances - Provides detailed findings with security recommendations **Other Options Explained:** - **AWS Trusted Advisor (A)**: Provides cost optimization, performance, and security recommendations but doesn't specifically analyze EC2 instances against security templates - **AWS WAF (C)**: Web Application Firewall that protects web applications from common web exploits - **AWS Shield (D)**: Managed DDoS protection service, not for vulnerability assessment As mentioned in the AWS documentation, Amazon Inspector enables you to define assessment targets with AWS resources and create assessment templates to identify potential security issues.

Author: Ritesh Yadav