An enterprise needs to back up Amazon EC2 instances, Amazon RDS databases, and Amazon EFS file systems across multiple AWS Regions. The backups must be immutable to protect against ransomware. Which solution is MOST operationally efficient?

Write custom Lambda scripts to create snapshots and copy them to an S3 bucket with Object Lock.

Use AWS Backup with cross-region copy and enable AWS Backup Vault Lock in compliance mode.

Use Data Lifecycle Manager (DLM) for EC2 and RDS, and AWS DataSync for EFS.

Enable automated backups on all services and use AWS Config to verify they are running.