Which solution will meet these requirements?

Explanations:

While this option configures AWS Config to identify unencrypted EBS volumes and sets up automatic remediation with a runbook, it does not prevent the creation of unencrypted volumes as required by the company’s security policy. The key policy statement to deny unencrypted volume creation is not a valid method to enforce encryption on volume creation.

This option creates a list of unencrypted EBS volumes and an automation runbook to create encrypted volumes, but it relies on Service Control Policies (SCPs) to deny unencrypted volume creation. SCPs apply at the organization level, not per account, and thus cannot enforce the prevention of unencrypted EBS volumes directly. Additionally, it lacks a proactive measure to automatically remediate unencrypted volumes.

This option uses AWS Systems Manager Fleet Manager to identify unencrypted EBS volumes and creates a runbook for remediation, but it does not implement an automatic remediation process. It does mention modifying the EBS encryption setting, but without configuring a proactive measure to remediate existing unencrypted volumes, it fails to meet the requirement fully.

This option effectively identifies unencrypted EBS volumes using AWS Config, sets up an automatic remediation action with a runbook, and modifies the AWS account settings to always encrypt new EBS volumes. This comprehensive approach ensures both existing and future EBS volumes comply with the security policy.