committed the violation. Upon the expiration of the 30-day period which begins on the date the general counsel provides such notification, the general counsel’s determination shall take effect, unless during such 30-day period the Commission, by vote of a majority of the members of the Commission who are serving at the time, overrules the general counsel’s determination. If the determination by the general counsel that the Commission should investigate the matter takes effect, or if the determination by the general counsel that the complaint should be dismissed is overruled as provided under the previous sentence, the general counsel shall initiate an investigation of the matter on behalf of the Commission. (B) If the Commission initiates an investigation pursuant to subparagraph (A), the Commission, through the Chair, shall notify the subject of the investigation of the alleged violation. Such notification shall set forth the factual basis for such alleged violation. The Commission shall make an investigation of such alleged violation, which may include a field investigation or audit, in accordance with the provisions of this section. The general counsel shall provide notification to the Commission of any intent to issue a subpoena or conduct any other form of discovery pursuant to the investigation. Upon the expiration of the 15-day period which begins on the date the general counsel provides such notification, the general counsel may issue the subpoena or conduct the discovery, unless during such 15-day period the Commission, by vote of a majority of the members of the Commission who are serving at the time, prohibits the general counsel from issuing the subpoena or conducting the discovery. (3) (A) Upon completion of an investigation under paragraph (2), the general counsel shall make a determination as to whether or not there is probable cause to believe that a person has committed, or is about to commit, a violation of this Act or chapter 95 or chapter 96 of the Internal Revenue Code of 1986, and shall