(1) The investigative unit of the department, within 30 days after the department receives the complaint, shall report to the director on the status of the investigation. If, for good cause shown, an investigation cannot be completed within 30 days, the director may extend the time in which a report may be filed. The total number of extensions permitted under this section shall be included in the report required by section 212.

  (2) If the report of the investigative unit of the department does not disclose a violation of this act or a rule promulgated or an order issued under this act, the complaint shall be closed by the department. The reasons for closing the complaint shall be forwarded to the respondent and complainant, who then may provide additional information to reopen the complaint.

  (3) If the report of the investigative unit made pursuant to subsection (1) discloses evidence of a violation of this act or a rule promulgated or an order issued under this act, the department or the department of attorney general shall prepare the appropriate action against the respondent which may be any of the following:

  (a) A formal complaint.

  (b) A cease and desist order.

  (c) A notice of summary suspension.

  (d) A citation.

  (4) At any time during its investigation or after the issuance of a formal complaint, the department may bring together the complainant and the respondent for an informal conference. At the informal conference, the department shall attempt to resolve issues raised in the complaint and may attempt to aid the parties in reaching a formal settlement or stipulation.