(b) The corporation shall determine within 10 working days after receipt of a request whether to comply with the request, and shall immediately notify the person making the request of the determination and identify the provision of this article or other provision of law that is the basis for withholding any record. Access to records requested, or copies thereof, shall be provided promptly after the corporation determines it will comply with the request. The corporation may extend the time limit for making a determination for up to an additional 15 working days by giving written notice to the requester when an extension is necessary to permit the corporation to do any of the following:

1. (1) To search for and collect the requested records from field facilities or other establishments that are separate from the office processing the request.
2. (2) To search for, collect, and appropriately examine a voluminous amount of separate and distinct records that are demanded in a single request.
3. (3) To consult with another person having a substantial interest in the determination of the request.
4. (4) To permit a determination to be made under this subdivision.