; or (B) may, if the Administrator determines the lack of qualification may not be remedied, take appropriate action, including prohibiting such individual from performing an authorized function. (3) Deadline (A) The Administrator shall complete the review required under paragraph (1) not later than 18 months after the date on which such review was initiated. (B) If the Administrator fails to complete the review in compliance with subparagraph (A), the Secretary of Transportation shall assume the responsibility for completing the review. (C) The Secretary’s completion of the review under subparagraph (B)— (i) may not be delegated to the Administration