Which service should be used to quickly remediate the issue and bring the resources back into compliance?

Explanations:

AWS Config is a service that monitors and records resource configurations, but it does not actively remediate patch compliance issues. It can provide compliance reports but cannot apply patches.

Amazon Inspector is a security assessment service that helps identify vulnerabilities in applications, but it doesn’t manage patch compliance or remediation of resources.

AWS Trusted Advisor is a recommendation service that provides best practices for AWS accounts, but it does not handle patch compliance or remediation tasks.

AWS Systems Manager includes Patch Manager, which can automate patching of instances to bring them back into compliance with patching standards. It is designed for this kind of operational remediation.