Answer: AWS CloudTrail

AWS CloudTrail is the correct answer as it is a service that enables governance, compliance, operational auditing, and risk auditing of your AWS account. It provides event history of your AWS account activity, including actions taken through the AWS Management Console, AWS SDKs, command line tools, and other AWS services. This allows you to determine the user who deleted an Amazon EC2 instance by reviewing the CloudTrail logs. Amazon CloudWatch is primarily used for monitoring AWS resources and applications, AWS Trusted Advisor provides recommendations to help you follow AWS best practices, and Amazon Inspector is an automated security assessment service that helps improve the security and compliance of your applications.

Author: LeetQuiz Editorial Team