(b) The Department of Motor Vehicles shall respond within five business days to a written request for records, reasonably described. Such response shall consist of either:

1. (1) the furnishing of the records requested; or
2. (2) the denial of the request in writing; or

3. (3) a written acknowledgment of the receipt of the request and a statement of the approximate date when such request will be granted or denied.

   If the department determines to grant a request in whole or in part, and if circumstances prevent disclosure to the person requesting the record or records within 20 business days from the date of the acknowledgment of the receipt of the request, the agency shall state, in writing, both the reason for the inability to grant the request within 20 business days and a date certain within a reasonable period, depending on the circumstances, when the request will be granted in whole or in part. Failure of the department to conform to the provisions of this subdivision shall constitute a denial of access to records subject to appeal pursuant to section 160.7 of this Part.