Answer: AWS Trusted Advisor

The correct answer is AWS Trusted Advisor (Option B). AWS Trusted Advisor provides recommendations to optimize AWS infrastructure, improve security and performance, reduce costs, and monitor service quotas. It alerts users when their account reaches more than 80% of a service quota in any region, which is the requirement stated in the question. AWS CloudTrail (Option A) is used for governance, compliance, and operational and risk auditing of your AWS account, but it does not provide quota alerts. AWS Config (Option C) enables you to assess, audit, and evaluate the configurations of your AWS resources, but it does not provide quota alerts by default. Amazon Inspector (Option D) is an automated security assessment service that helps improve the security and compliance of your applications, but it is not related to service quota monitoring or alerts.

Author: LeetQuiz Editorial Team