The Commission shall conduct proceedings on the record with the opportunity for a hearing subject to this subpart whenever:

(a) The Commission determines that a complaint filed under part 3022 of this chapter raises one or more material issues of fact or law in accordance with § 3022.30 of this chapter and a proceeding on the record with the opportunity for a hearing is necessary;

(b) The Commission determines that the streamlined procedures in part 3020 of this chapter applicable to a Postal Service request to change the nature of postal services which will generally affect service on a nationwide or substantially nationwide basis are not appropriate; or

(c) The Commission in the exercise of its discretion determines it is appropriate.