; and (II) requests for higher level review under section 5104B of such title, as added by section 2(g); and (ii) with respect to appeals, disaggregated by docket of the Board maintained under section 7107 of such title, as amended by section 2(t). 6. Definitions In this Act: (1) The term claimant has the meaning given such term in section 5100 of title 38, United States Code. (2) The term legacy claim means a claim— (A) that was submitted to the Secretary of Veterans Affairs for a benefit under a law administered by the Secretary; and (B) for which notice of a decision under section 5104 of title 38, United States Code, was provided by the Secretary before the date set forth in section 2(x)(1). (3) The term opt in means, with respect to a legacy claim of a claimant, that the claimant elects to subject the claim to the modernized appeals system pursuant to— (A) section 2(x)(3); or (B) such other mechanism as the Secretary may prescribe for purposes of carrying out this Act and the amendments made by this Act. (4) The term modernized appeals system means the set of processes and mechanisms by which the Secretary processes, pursuant to the authorities and requirements modified by section 2, claims for benefits under laws administered by the Secretary.