Some records are exempt from disclosure, in whole or in part. If the department believes that a record is exempt from disclosure and should be withheld, the public records officer or designee will state the specific exemption and provide a brief explanation of why the record or a portion of the record is being withheld. If only a portion of a record is exempt from disclosure, but the remainder is not exempt, the public records officer or designee will redact the exempt portions, provide the nonexempt portions, and indicate to the requestor why portions of the record are being redacted. RCW 42.56.070(1).