Which AWS service provides on-demand access to security and compliance reports for AWS infrastructure?

AWS Artifact is the correct answer because it is a central resource for on-demand access to AWS security and compliance reports and select online agreements. It provides access to documents like ISO certifications, SOC reports, and PCI DSS attestations, which are crucial for auditing and compliance. Amazon GuardDuty is an intelligent threat detection service that monitors for malicious activity and unauthorized behavior. AWS Security Hub provides a comprehensive view of your security alerts and security posture across your AWS accounts. AWS Shield is a managed Distributed Denial of Service (DDoS) protection service. While these services are security-related, they do not provide access to compliance reports.