(a) Any person may be required to produce things or documents in response to a subpoena under the Act.

(b) If a person responding to a subpoena for production of things or documents withholds a record or document on the basis of a privilege, the person shall state, with respect to each document:

  (1) The name and title of the author of the document;

  (2) The names and titles of all persons to whom the document was addressed;

  (3) The names and titles of all persons to whom copies of the document were sent;

  (4) The date on which the document was written or otherwise produced and the date on which it was mailed, sent, or delivered to its addressee;

  (5) The number of pages in the document;

  (6) A brief description of the nature or subject matter of the document;

  (7) The basis on which the document is being withheld; and

  (8) The paragraph number of the subpoena to which the document is responsive.

(c) Obligation to supplement responses. If a person has responded to a subpoena under this regulation and later discovers or obtains additional documents or things responsive to the subpoena, the person shall supplement the response as soon as reasonably possible.