; (ii) to answer in writing written interrogatories with respect to such documentary material or information; or (iii) to give oral testimony concerning such documentary material or information. (B) Requirements Each civil investigative demand issued under subparagraph (A) shall state the nature of the conduct constituting the alleged violation of a foreign agents law which is under investigation, and the applicable provision of law alleged to be violated. (C) Production of documents Each civil investigative demand issued under subparagraph (A) for the production of documentary material shall— (i) describe each class of documentary material to be produced with such definiteness and certainty as to permit such material to be fairly identified; and (ii) prescribe a return date for each such class which will provide a reasonable period of time within which the material so demanded may be assembled and made available for inspection and copying. (D) Demand for written answers Each civil investigative demand issued under subparagraph (A) for answers to written interrogatories shall— (i) set forth with specificity the written interrogatories to be answered; and (ii) prescribe dates at which time answers to written interrogatories shall be submitted. (E) Oral testimony Each civil investigative demand issued under subparagraph (A) for the giving of oral testimony shall— (i) prescribe a date, time, and place at which oral testimony shall be commenced; (ii) specify that such attendance and testimony are necessary to the conduct of the investigation; (iii) notify the person receiving the demand of the right to be accompanied by an attorney and any other representative