; (6) maintain confidential any matter related to complaints and inquiries, including the identities of the complainants and witnesses; and (7) submit an annual report to the appropriate congressional committees in accordance with subsection (c). (c) Annual report (1) In general The Ombudsman shall report no later than September 30 each year to the appropriate congressional committees on the actions taken by the Office of the Ombudsman over the preceding year and the objectives of those actions. (2) Contents Each such report shall, for the period covered by the report, include— (A) statistical information, by region, on the volume of complaints received, general nature of complaints, general information on complainants, and the percentage of complaints that resulted in a fact-finding inquiry; (B) a summary of problems encountered by complainants, including information on the most pervasive or serious types of problems encountered by complainants; (C) policy recommendations that the Office of the Ombudsman made to the Administrator of the Transportation Security Administration; (D) an inventory of the items described in subparagraphs (B) and (C) for which action has been taken, and the result of such action; (E) an inventory of the items described in subparagraphs (B) and (C) for which action remains to be completed