A. Use S3 presigned URLs to share the documents with the external users. Set an expiration time of 7 days.
B. Move the documents to an Amazon WorkDocs folder. Share the links of the WorkDocs folder with the external users.
C. Create temporary IAM users that have read-only access to the S3 bucket. Share the access keys with the external users. Expire the credentials after 7 days.
D. Create a role that has read-only access to the S3 bucket. Share the Amazon Resource Name (ARN) of this role with the external users.

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