Explanation

IAM credential reports are the correct choice because:

• IAM credential reports provide detailed information about IAM users in your AWS account, including whether MFA is enabled for each user
• These reports can be generated and downloaded from the IAM console or via AWS CLI/API
• The reports contain a column specifically indicating MFA device status for each user
• This allows administrators to audit and verify MFA compliance across all users

Why the other options are incorrect:

• AWS Cost and Usage Report: This service provides billing and cost information, not security configuration details
• AWS Artifact: This service provides compliance reports and documentation, but not real-time MFA status for users
• Amazon CloudFront reports: These provide content delivery network analytics and performance metrics, not IAM user security settings

IAM credential reports are specifically designed for security auditing purposes, making them the appropriate tool for verifying MFA configuration across all users in AWS accounts.