You're a Workspace Owner for a financial organization on the Slack Business+ plan.

In the Slack Business+ plan, to meet compliance requirements where deleted files must remain discoverable, you must set file retention to:

"Keep all files, including deleted files."

This ensures that even after a user deletes a file, it remains accessible for auditing and compliance purposes. Simply keeping files (B) does not guarantee deleted files are retained. Options involving "for a set number of days" (C, E) would risk data loss after the timeframe expires, and D (all file versions) focuses on version history, not deletion recovery.

(Reference: Slack Administration Study Guide - File Retention and Compliance Settings)

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