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Which of the following services can provide a complete audit trail of all AWS services used within an account.
Explanation:
Amazon CloudWatch is the correct answer because it provides comprehensive monitoring and logging capabilities across AWS services. CloudWatch can collect and track metrics, collect and monitor log files, and set alarms. It offers a complete audit trail by:
Why the other options are incorrect:
AWS Trusted Advisor (A): This service provides recommendations to optimize AWS infrastructure for cost optimization, performance, security, and fault tolerance, but it does not provide a complete audit trail of service usage.
Amazon EC2 instance usage report (B): This only provides usage data specifically for EC2 instances and does not cover all AWS services used within an account.
For a complete audit trail of ALL AWS services used within an account, Amazon CloudWatch is the appropriate service as it can monitor and log activities across the entire AWS environment.