; and (ii) prescribe a return date for production of the documentary material at least twenty days after issuance of the demand to give the State or political subdivision, or other governmental representative or agent, a reasonable period of time for assembling the documentary material and making it available for inspection and copying. (D) Answers to written questions If the demand issued under paragraph (1) requires answers in writing to written questions, it shall— (i) set forth with specificity the written question to be answered; and (ii) prescribe a date at least twenty days after the issuance of the demand for submitting answers in writing to the written questions. (E) Service A demand issued under paragraph (1) may be served by a United States marshal or a deputy marshal, or by certified mail, at any place within the territorial jurisdiction of any court of the United States. (3) Responses to an Attorney General demand A State or political subdivision, or other governmental representative or agent, must, with respect to any documentary material or any answer in writing produced under this subsection, provide a sworn certificate, in such form as the demand issued under paragraph (1) designates, by a person having knowledge of the facts and circumstances relating to such production or written answer, authorized to act on behalf of the State or political subdivision, or other governmental representative or agent, upon which the demand was served. The certificate— (A) shall state that— (i) all of the documentary material required by the demand and in the possession, custody, or control of the State or political subdivision, or other governmental representative or agent, has been produced; (ii) that with respect to every answer in writing to a written question, all information required by the question and in the possession, custody, control, or knowledge of the State or political subdivision, or other governmental representative or agent, has been submitted; or (iii) both