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D. Use an IAM policy within the Amazon Cognito identity prefix to restrict users to use their own folders in Amazon S3.
C) Eliminated - Lambda would need to handle the file transfer and validation, which could introduce scaling issues for large file sizes (300 MB).
B) Eliminated - Storing file details in DynamoDB and using it to filter access in the UI could be helpful for organizing and tracking files. However, this does not address the core security concern of restricting direct access to S3 objects themselves. Even though DynamoDB can help track files, it still doesn't enforce access control on the S3 objects themselves