; and (ii) by striking hearing and ; (B) by amending subsection (b) to read as follows: (b) (1) (A) Except in the case of simultaneously contested claims, notice of disagreement shall be filed within one year from the date of the mailing of notice of the decision of the agency of original jurisdiction pursuant to section 5104, 5104B, or 5108 of this title. (B) A notice of disagreement postmarked before the expiration of the one-year period shall be accepted as timely filed. (C) A question as to timeliness or adequacy of the notice of disagreement shall be decided by the Board. (2) (A) Notices of disagreement shall be in writing, shall set out specific allegations of error of fact or law, and may be filed by the claimant, the claimant's legal guardian, or such accredited representative, attorney, or authorized agent as may be selected by the claimant or legal guardian. (B) Not more than one recognized organization, attorney, or agent may be recognized at any one time in the prosecution of a claim. (C) Notices of disagreement shall be filed with the Board. (3) (A) The notice of disagreement shall indicate whether the claimant requests— (i) a hearing before the Board; (ii) an opportunity to submit additional evidence without a hearing before the Board; or (iii) a review by the Board without a hearing or submission of additional evidence. (B) If the claimant does not expressly request a hearing before the Board in the notice of disagreement, no hearing before the Board may be held. ; (C) by amending subsection (c) to read as follows: (c) If no notice of disagreement is filed in accordance with this chapter within the prescribed period, the action or decision of the agency of original jurisdiction shall become final and the claim may not thereafter be readjudicated or allowed, except as may otherwise be provided by section 5104B or 5108 of this title or such regulations as the Secretary may promulgate that are consistent with this title.