; (B) the methodology used to collect such information; (C) the degree to which financial institutions provided information requested; (D) why such information is not sufficient to develop the advisory described in subsection (b)(1); and (E) any barriers to obtaining the information that is required to develop the advisory described in subsection (b)(1). (d) Rulemaking Not later than 90 days after the date of enactment of this Act, FinCEN, in consultation with the Director of the Federal Bureau of Investigation and the Director of the Bureau of Alcohol, Tobacco, Firearms and Explosives of the Department of Justice, shall promulgate a rule that defines the following terms for the purpose of this section: (1) Firearm accessory. (2) Homegrown violent extremist. (3) Lone wolf. (4) Lone actor.