; and (B) when practicable, the covered employee has communicated or attempted to communicate such reasonable apprehension to the covered employer and has not received from the covered employer a response reasonably calculated to allay such apprehension. (3) Complaint Any covered employee who believes that the covered employee has been discharged, disciplined, or otherwise retaliated or discriminated against by any person in violation of subsection (c)(1) or paragraph (2) of this subsection may seek relief for such violation by filing a complaint with the Secretary under paragraph (5). (4) Statute of limitations (A) In general A covered employee may take the action permitted by paragraph (3) not later than 180 days after the later of— (i) the date on which an alleged violation of subsection (c)(1) or paragraph (2) of this subsection occurs; or (ii) the date on which the covered employee knows or should reasonably have known that such alleged violation occurred. (B) Repeat violation Except in cases when the covered employee has been discharged, a violation of subsection (c)(1) or paragraph (2) of this subsection shall be considered to have occurred on the last date an alleged repeat violation occurred. (5) Investigation (A) In general A covered employee may, within the time period required under paragraph (4)(A), file a complaint with the Secretary alleging a violation of subsection (c)(1) or paragraph (2) of this subsection. 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