A company must retain application log files for 10 years. The application team frequently accesses logs from the past month, while logs older than 1 month are rarely accessed. The application generates more than 10 TB of logs per month. Which storage option is the MOST cost-effective while meeting the retention and access requirements?

Storing logs directly in Amazon S3 is cost-effective for large volumes, and S3 Lifecycle policies automate the transition of objects to lower-cost storage classes like S3 Glacier Deep Archive. This meets the 10-year retention requirement at the lowest cost for rarely accessed older data. S3 Glacier Deep Archive is ideal for data accessed once or twice a year. AWS Backup is not designed for routine lifecycle management of S3 objects. While CloudWatch Logs can ingest logs, it becomes significantly more expensive than S3 for 10 TB/month over 10 years, and its lifecycle management integrates with S3, making direct S3 storage more efficient for this scale.