; or (ii) the date on which the employee or other individual knows or should reasonably have known that such alleged violation occurred. (B) Repeat violation Except in cases when the employee or other individual has been discharged, a violation of paragraph (1) or (2) shall be considered to have occurred on the last date an alleged repeat violation occurred. (5) Investigation (A) In general An employee or other individual performing work for a person may, within the time period required under paragraph (4)(A) , file a complaint with the Secretary alleging a violation of paragraph (1) or (2). If the complaint alleges a prima facie case, the Secretary shall conduct an investigation of the allegations in the complaint, which— (i) shall include— (I) interviewing the complainant; (II) providing the respondent an opportunity to— (aa) submit to the Secretary a written response to the complaint; and (bb) meet with the Secretary to present statements from witnesses or provide evidence; and (III) providing the complainant an opportunity to— (aa) receive any statements or evidence provided to the Secretary; (bb) meet with the Secretary; and (cc) rebut any statements or evidence; and (ii) may include issuing subpoenas for the purposes of such investigation. (B) Decision Not later than 90 days after the filing of the complaint, the Secretary shall— (i) determine whether reasonable cause exists to believe that a violation of paragraph (1) or (2) has occurred