Which AWS service will meet this requirement?

Explanations:

AWS Trusted Advisor provides best practices and recommendations for AWS accounts, including identifying security groups that may be misconfigured, such as those allowing unrestricted access to certain ports.

Amazon CloudWatch is primarily used for monitoring and logging metrics and does not specifically analyze security group configurations for unrestricted access.

Amazon GuardDuty is a threat detection service that monitors for malicious activity and unauthorized behavior but does not specifically focus on identifying misconfigured security groups or their port access settings.

The AWS Health Dashboard provides insights into the health of AWS services and resources but does not assess security group configurations or monitor for unrestricted port access.