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AWS Certified Solutions Architect - Associate · AWS
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Anytime the "Operational efficiency"comes into picture, one should consider the options with serverless or managed services. DynamoDB is a serverlessservice, and AWS Backup is a managed service. Others involve operational work in terms of maintenance of backups etc.
Using AWS Backup is most suitable here for retaining data for 7 years.
Ans B - there are no special parameters specified for the backup (eg. PITR snapshots) so it doesn't need to be elaborate