Upon filing of a complaint, the Chairperson of the Commission shall designate an individual to investigate the allegations. The individual shall promptly investigate such allegations, and if he/she determines that probable cause exists for crediting the allegations of the complaint, he/she shall thereupon undertake to eliminate the alleged discriminatory practice or practices by conference, conciliation and persuasion or mediation and shall inform the Commission of the results of such efforts. If the individual determines that no such probable cause exists, he/she shall so report to the Commission, which shall thereupon dismiss the complaint without further proceedings, or direct further investigation or, if it determines that probable cause exists for crediting the allegations of the complaint, direct that the alleged discriminatory practice or practices be the subject of conference, conciliation and persuasion or mediation. Neither the members of the Commission nor any person participating in the investigation shall disclose what has occurred in the course of such efforts to conciliate. The determination of probable cause shall be made, and the investigation and conciliation or mediation shall be conducted, in accordance with such rules, regulations and guidelines as the Commission shall prescribe.