The **14-day retention rule** applies.

**Reasoning:**
1.  **Temporal Validity:** The policy snippets are organized by date. As of the current date (May 2024), the **2024-01** policy is the only one that has taken effect. The 2025-06 and 2026-05 policies are scheduled for the future and are not yet active.
2.  **Scope of Application:** While the 2026-05 policy is the only one that specifically mentions "production systems," it does not apply until its effective date. The 2024-01 policy is a general rule ("Backups are retained 14 days"), which applies to all systems, including production systems, until a more recent policy overrides it.