(a) Why the person is unable to supply a complete response;

(b) What information, and what specific documents or categories of documents, would have been required for a complete response;

(c) Who, if anyone, has the required information, and specific documents or categories of documents; and a description of all efforts made to obtain such information and documents, including the names of persons who searched for required information and documents, and where the search was conducted. If no such efforts were made, provide an explanation of the reasons why, and a description of all efforts necessary to obtain required information and documents;

(d) Where noncompliance is based on a claim of privilege, a statement of the claim of privilege and all facts relied on in support thereof, including the identity of each document, its author, the author's title/position, addressee, the addressee's title/position, date, subject matter, all recipients of the original and of any copies, the recipients' titles/positions, the document's present location, and who has control of it.