Which AWS service should the SysOps administrator use to meet these requirements in the MOST operationally efficient manner?

Explanations:

AWS Config provides a way to monitor the configuration of AWS resources and can be used to automatically detect and remediate changes to S3 bucket policies that allow public access. It allows you to define rules to evaluate the compliance of resources with corporate policies, thus ensuring that public read or write permissions are removed efficiently.

AWS Security Hub is a service that provides a comprehensive view of security alerts and security posture across AWS accounts. While it aggregates security findings, it does not actively manage or remediate S3 bucket permissions.

AWS Trusted Advisor is a service that provides real-time guidance to help you provision your resources following AWS best practices. Although it can identify public S3 buckets, it does not have the capability to automatically remove permissions; it merely provides recommendations.

Amazon Inspector is a security assessment service that helps improve the security and compliance of applications deployed on AWS. It focuses on network accessibility and application vulnerabilities rather than on monitoring and controlling S3 bucket permissions.