## Turn 1

We need to answer: "What is the backup retention policy?" The relevant chunk is [B] The backup retention policy is 35 days. So answer: "The backup retention policy is 35 days." Provide citation: [B]. The instruction: "Use only relevant chunks." So we should only cite [B]. Provide answer with policy and citation. Format: likely just the answer and citation. Let's produce: "The backup retention policy is 35 days. [B]".