Explanation:
The correct answer is generating a signed URL for each document. Signed URLs provide time-limited access to specific Cloud Storage objects. When generating the URL, an expiration time can be configured, after which the URL becomes invalid, automatically revoking access. This aligns with the requirement to revoke access after a configurable period.
Other options are unsuitable:
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How can you configure Cloud Storage to enable secure document sharing with external users while automatically revoking access after a configurable time period in a document sharing platform?
A
Create signed policy documents on the Cloud Storage bucket.
B
Apply access control list (ACL) permissions to the Cloud Storage bucket.
C
Generate a signed URL for each document the user wants to share.
D
Grant the Storage Object Viewer IAM role to all authenticated users.