in writing written interrogatories with respect to such documentary material or information, to give oral testimony concerning such documentary material or information, or to furnish any combination of such material, answers, or testimony. Whenever a civil investigative demand is an express demand for any product of discovery, the Attorney General or designee shall cause to be served, in any manner authorized by this section, a copy of such demand upon the person from whom the discovery was obtained and notify the person to whom such demand is issued of the date on which such copy was served. (2) Limiting individuals who may serve as designees The Attorney General may not designate any individual other than the Assistant Attorney General for National Security or a Deputy Attorney General to carry out the authority provided under this section. (b) Contents and deadlines (1) In general Each demand issued under subsection (a) shall— (A) state the nature of the conduct constituting the alleged violation of this Act which is under investigation and the provision of this Act alleged to be violated