A company is building a file-sharing application that stores files in an Amazon S3 bucket and serves them via an Amazon CloudFront distribution. The company does not want users to access files directly through the S3 URL. What should a solutions architect do to satisfy these requirements?

Creating an Origin Access Identity (OAI) is the correct and most secure method. An OAI is a special CloudFront user that CloudFront uses to access objects in your S3 bucket. By configuring the S3 bucket policy to grant read permissions only to this OAI, you prevent direct access to S3 objects via their S3 URLs, ensuring all requests go through CloudFront. Writing individual policies for each S3 bucket is inefficient and doesn't inherently restrict direct S3 access. Creating an IAM user and assigning it to CloudFront is not the standard or recommended practice for this specific integration; OAIs are designed for this purpose. Writing an S3 bucket policy with the CloudFront distribution ID as the Principal is incorrect syntax and not how CloudFront integrates with S3 for restricted access.