; (ii) answer in writing written interrogatories with respect to such documentary material; (iii) give oral testimony concerning such documentary material; or (iv) furnish any combination of such material, answers, or testimony. (B) Service If a civil investigative demand issued under subparagraph (A) is an express demand for any product of discovery, the Attorney General shall— (i) cause to be served, in any manner authorized under section 3733 of title 31, United States Code, a copy of the demand upon the person from whom the discovery was obtained; and (ii) notify the person to whom the demand is issued of the date on which the copy was served. (2) Contents; return date for demand for product of discovery (A) In general Each civil investigative demand issued under paragraph (1) shall— (i) state the nature of the Attorney General’s belief that a false certification has been filed under subsection (d); (ii) if the demand is for production of documentary material— (I) describe the class or classes of documentary material to be produced thereunder with such definiteness and certainty as to permit such material to be fairly identified; (II) prescribe a return date or dates that will provide a reasonable period of time within which the material so demanded may be assembled and made available for inspection and copying; and (III) identify the custodian to whom the material shall be made available; (iii) if the demand is for answers to written interrogatories— (I) propound with definiteness and certainty the written interrogatories to be answered; (II) prescribe a date or dates at which time answers to written interrogatories shall be submitted; and (III) identify the custodian to whom the answers shall be submitted; and (iv) if the demand is for the giving of oral testimony— (I) prescribe a date, time, and place at which oral testimony shall be commenced; and (II) identify— (aa) an investigator who shall conduct the examination