The correct choice is AWS Trusted Advisor. AWS Trusted Advisor is the AWS native advisor that reviews multiple accounts and provides actionable best practice checks to improve performance, control service quota usage, and reduce costs.

AWS Trusted Advisor analyzes resource configurations and usage and returns prioritized recommendations across categories such as cost optimization, performance, fault tolerance, security, and service limits. The service provides prescriptive checks and suggested actions so you can reduce spend, tune performance, and avoid hitting quotas.

Amazon CloudWatch focuses on observability and monitoring. It collects metrics, logs, and events and can alert on thresholds, and it does not provide consolidated prescriptive best practice checks for cost, performance, and quotas like the advisor service does.

AWS Health Dashboard reports account specific service health events and ongoing incidents and it helps with incident awareness, and it does not deliver optimization guidance or proactive best practice checks across accounts.

Amazon Inspector is designed for automated security assessments and vulnerability scanning of workloads, and it does not perform cost optimization or service quota recommendations so it is not the right advisor for those needs.

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